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Every year around the holidays MetaFilter hosts a page, called MeFi Mall, which links to things that creative MeFites are selling or have for sale. The page is for MeFites only and is for online stuff that they've designed, created, built, made or otherwise had a hand in.
MeFi Mall excludes physical stores, auctions, or one-off items for sale. Brick and mortar stores owned by MeFites can be found on the here on the wiki at MeFi Stores.