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LEGO Insiders Double Points events roughly double the ~5% base rebate to ~10%. Best for exclusives with no other discount route.
Triple Points windows are rarer and usually tied to a flagship theme launch — the highest-leverage Insiders days of the year.
Black Friday / Insiders Days typically overlaps multipliers, gift-with-purchase offers, and cashback portals — usually the single best window of the year.
Sets nearing retirement often get discounted by third-party retailers (Amazon, Target, Walmart) before LEGO.com itself moves.