Three LEGO sets are trading 29–44% below retail. All three retire within months. The model didn't rank them by discount. It ranked them by exit dynamics — liquidity, data confidence, and real holding period risk.
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The thesis has two legs. Retirement in 9 weeks removes new supply. Dune Part Three releases December 18, 2026 — five months after retirement. If the film performs, retired supply meets renewed franchise demand exactly when it can no longer be purchased at retail.
Kleinanzeigen at €100 is the best verified entry — the seller ships. BrickLink at €115 is the liquid consensus price. Leboncoin shows €120 as the next available option. All three are 44% or more below EU retail of €177.
This set ranks second because Liquidity (7/10) and Confidence (7/10) are strong — consistent multi-platform EU data and confirmed buyer activity. Harry Potter edges ahead on the strength of its double catalyst and confirmed series premiere date.
The risk: Dune Part Three underperforms. Post-retirement demand stays thin. Entry below €115 limits losses, but appreciation depends on franchise performance.
The set is trading 29% below retail with consistent data across six marketplaces. The secondary market has not priced in the retirement premium yet. That is the entry signal — and the HP series premiere on December 25, 2026 makes the timing structure considerably stronger.
The double catalyst is what moves this to #1 this week. Retirement and the Harry Potter series premiere on Max (HBO Max) happen in the same month. Retired supply meets renewed franchise demand at the moment new buyers enter the market. This is the same structure as the Dune thesis — but with a confirmed premiere date and 25 years of proven secondary market behaviour behind the IP.
The minifigure configuration is the downside floor. The complete Weasley family plus Harry Potter exists only in this set. Collectors buy for the figures alone. Confidence scores 8/10 — the tightest price variance of the three signals this week at 8% across six platforms.
The longer retirement window (30 weeks) means capital is deployed longer than the July signals. The thesis depends on the retirement premium and series launch materialising together in Q4 2026.
This set ranks third not because the thesis is weak — all six dimensions score positively — but because Liquidity (5/10) is the lowest of the three signals. Nine BrickLink transactions in 90 days is slower movement than a 34% discount and 9-week retirement window would typically produce.
That gap is the primary risk. If buyer response doesn't accelerate before July 31, capital stays tied up longer than the timeline implies. The other two signals this week both show faster sell-through at comparable entry positions.
The D&D franchise is not relying on nostalgia. The 2024 film delivered €715M globally. Fan-voted origin means this set carries a collector premium standard playsets don't. No confirmed follow-up LEGO D&D theme currently exists — this remains the flagship set after retirement.
The Leboncoin entry at €260 is a regional arbitrage opportunity for buyers sourcing from France. BrickLink at €291 is the liquid market consensus.
Three signals this week. Three Entry scores of 10. All buying between 29% and 60% below retail.
The model ranked them differently anyway.
The Dune set trades at 60% below retail. It ranks first — because buyers are active across multiple EU platforms and the data is consistent.
The D&D set trades at 34% below retail. It ranks third — because 9 BrickLink transactions in 90 days is slower than the entry discount and retirement window would normally produce.
BrickEconomy shows you the price. Flowbitrage shows you whether you can get out.
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