July 26 LEGO radar: Dune keeps the deepest discount, Mars Rover the cleanest forecast (2026)

The short version

No timestamped listing cleared this week's verification pass on eBay, Mercari, Vinted, Depop, or BrickLink. The useful result is a cleaner price screen for sets estimated to retire on July 31, 2026: Dune Atreides Royal Ornithopter has the deepest reference discount, while the NASA Mars Perseverance Rover has the strongest forecast profile. These are buy ceilings for saved searches, not live offers.

The prices below are BrickRanker's six-month average sale references compared with original US retail price. BrickLink supply counts were not available, so the scarcity ranking is provisional. Retirement timing, recorded sales, discount size, and forecast spread are usable signals; they are not substitutes for a verified listing, seller history, or item photos. 1 2 3

Ranked price screen

Rank	Set and theme	Retirement	Reference price vs. MSRP	Forecast and sales	Marketplace record this week
1	10327 Dune Atreides Royal Ornithopter, Icons	Jul 31, 2026 (estimated)	$98.50 vs. $164.99, 40.3% below	+31.47% two-year forecast; 26.38% to 35.68% range; 184 sales	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed
2	42158 NASA Mars Perseverance Rover, Technic	Jul 31, 2026 (estimated)	$70.80 vs. $99.99, 29.2% below	+40.21% forecast; 37.54% to 42.98% range; 75 sales	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed
3	21058 Great Pyramid of Giza, Architecture	Jul 31, 2026 (estimated)	$112.76 vs. $129.99, 13.3% below	+29.97% forecast; 24.45% to 35.48% range; 139 sales	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed
4	76417 Gringotts Wizarding Bank - Collectors' Edition, Harry Potter	Jul 31, 2026 (estimated)	$400.07 vs. $429.99, 7.0% below	+15.90% forecast; 6.25% to 25.55% range; 320 sales	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed
5	21348 Dungeons & Dragons: Red Dragon's Tale, Ideas	Jul 31, 2026 (estimated)	$334.43 vs. $359.99, 7.1% below	+14.91% forecast; 215 sales; no meaningful spread displayed	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed
6	77092 Great Deku Tree 2-in-1, The Legend of Zelda	Jul 31, 2026 (estimated)	$315.57 vs. $299.99, 5.2% above	Forecast not provided; 147 sales	Listing price, condition, platform, URL, seller signal, and timestamp: unconfirmed

The order favors a material discount first, then forecast quality and sales depth. All six share the same estimated retirement month, so the date alone cannot separate them. A low recorded-sales count means a thinner price signal, not automatic proof of rarity. 1 2 4 5 6 7

1. Dune Atreides Royal Ornithopter, 10327

Reference screen: $98.50 against a $164.99 MSRP, or 40.3% below retail. BrickRanker lists 1,369 pieces, a July 2026 estimated retirement, 184 recorded sales, and a +31.47% two-year forecast with a 26.38% to 35.68% range. The discount is the strongest in this pool, and the forecast has enough spread to keep the call positive without treating it as certain. 1

Action: Start a saved search around $99 for a sealed copy or a complete opened copy with clear photos. The reference price is not a current listing price. A marketplace seller needs to beat that ceiling after shipping, tax, and any missing-piece risk before the offer becomes interesting.

Authentication check: Ask for a sharp photo showing box number 10327, the seals or box flaps, and the instruction material. For an opened copy, require a parts-spread photo and clear views of every licensed minifigure, including accessories. A distant stock image, a generic "complete" label, or a seller who will not show the set number is not enough at this price level.

2. NASA Mars Perseverance Rover, 42158

Reference screen: $70.80 against a $99.99 MSRP, or 29.2% below retail. The page reports 1,132 pieces, 75 recorded sales, a July 2026 estimated retirement, and the strongest two-year forecast here at +40.21%. Its 37.54% to 42.98% range is only 5.44 percentage points wide, which makes the forecast less fragile than a headline based on one or two sales. 2

Action: Use roughly $71 as the first ceiling for a complete set. This is the best hold-and-resell profile in the screen, but the forecast is still a model estimate. Do not pay a premium simply because the set is close to its retirement date.

Authentication check: For a used listing, request a wide photo of the assembled rover, the instructions, and a parts spread that includes the wheels, articulated Technic sections, and distinctive panels. Match the seller's photos against the official set number and inventory before paying for a loose build. Missing structural parts can be harder to spot than a missing minifigure, so "built once" is not a completeness check.

3. Great Pyramid of Giza, 21058

Reference screen: $112.76 against a $129.99 MSRP, or 13.3% below retail. BrickRanker lists 1,476 pieces, 139 recorded sales, a July 2026 estimated retirement, and a +29.97% two-year forecast with a 24.45% to 35.48% range. The smaller discount is offset by a broader sales base than the Mars Rover, making this a steadier collector reference than a deep-discount play. 4

Action: Keep the high-$110s as a ceiling for a clean complete copy. Below $100 would be a much stronger entry, while a loose model near the reference price needs an inventory and instruction booklet to justify the risk.

Authentication check: Ask for a photo of the box or instruction cover showing 21058, plus wide shots of the full model and the parts laid out separately. For a loose build, check that the seller is offering the original set rather than a similar-looking Architecture model assembled from mixed parts. Dust, yellowing, and missing small architectural elements should lower the price even when the model looks complete from a distance.

4. Gringotts Wizarding Bank - Collectors' Edition, 76417

Reference screen: $400.07 against a $429.99 MSRP, or 7.0% below retail. The set has 4,803 pieces, 320 recorded sales, a July 2026 estimated retirement, and a +15.90% two-year forecast. The range is wide at 6.25% to 25.55%, so the 320-sale sample supports the reference price better than it supports a precise appreciation promise. 5

Action: This is a completeness-sensitive buy, not a rush-to-retail play. Keep the reference price as a ceiling for a sealed box in good condition. For an opened set, demand a full inventory, instructions, and photos of the licensed minifigures before treating a 7% discount as meaningful.

Authentication check: Verify box number 76417, the box condition, and the instruction materials. Ask the seller to show the minifigure tray or every figure individually when the set is opened. A large licensed set photographed only from the front can conceal missing figures, swapped parts, or heavy box damage.

5. Dungeons & Dragons: Red Dragon's Tale, 21348

Reference screen: $334.43 against a $359.99 MSRP, or 7.1% below retail. BrickRanker lists 3,745 pieces, 215 recorded sales, a July 2026 estimated retirement, and a +14.91% two-year forecast. The page shows the same 14.91% low and high value rather than a useful forecast band, so this is a modest discount case with less information about upside than the Mars Rover or Great Pyramid. 6

Action: Use $334 as a reference ceiling, not a reason to buy immediately. The discount is only about $26 against retail before fees and shipping. A sealed, undamaged box can justify attention; an opened set should be substantially cheaper unless the seller documents every figure and specialty element.

Authentication check: Ask for a photo of box number 21348, the instruction booklets, and the complete character and creature minifigure group. For a sealed copy, inspect the seals and box corners rather than accepting a catalog image. For an opened copy, a parts spread plus individual figure photos are stronger evidence than a single completed display shot.

6. Great Deku Tree 2-in-1, 77092

Reference screen: $315.57 against a $299.99 MSRP, so the current reference is 5.2% above retail. The set has 2,500 pieces, 147 recorded sales, and a July 2026 estimated retirement. The detail page did not provide a two-year forecast or forecast range. That combination makes it a watchlist entry, not a discount pick. 7

Action: Skip at or above MSRP unless the condition is exceptional and the seller's evidence is unusually strong. A real discount should start below $300, with a deeper margin for an opened copy because the set's price reference is already above retail and has no forecast attached.

Authentication check: Verify box number 77092 and ask to see the instruction materials for both 2-in-1 build options. For an opened set, request photos of the major modules and a complete inventory rather than accepting one finished configuration as proof that the second build can be made. Treat a loose pile advertised with a single front-facing photo as parts until proven otherwise.

What the marketplace pass actually found

The tracked search produced no usable, timestamped detail page from eBay, Mercari, Vinted, Depop, or BrickLink for this Jul 19 to Jul 26 window. That means there is no honest listing URL, seller rating, item condition, or current offer price to attach to any ranked entry. The article therefore reports reference ceilings and saved-search actions, not claimed availability.

The gap matters most for high-value sets. A $400 six-month average for Gringotts does not tell you whether an individual listing is sealed, complete, damaged, or missing figures. A $98.50 reference for Dune does not prove that a seller will offer it this week. Buyers should compare a real listing's date, condition, photos, seller history, shipping, and return terms against the reference screen before making an offer.

Action order

Save searches for 10327 near $99 and 42158 near $71. These are the two strongest buy screens in this week's pool.
Watch 21058 around the high-$110s, but demand complete-set evidence for any opened copy.
Treat 76417 and 21348 as sealed-box opportunities only when the discount survives shipping and the seller documents the contents.
Skip 77092 above retail. Revisit only when a real listing falls below $300 and the seller can document both build options.
For every hit, verify the listing date first. Then check set number, condition, seller history, box or instruction evidence, and a complete-parts photo before comparing with these ceilings.

This week's practical split is straightforward: Dune offers the strongest discount, Mars Rover offers the cleanest forecast, Great Pyramid offers the most balanced middle ground, and Deku Tree is not a deal at its current reference level. None is a verified live marketplace bargain until a dated listing with condition evidence appears.

July 26 LEGO radar: Dune keeps the deepest discount, Mars Rover the cleanest forecast