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Free: Sourcing Channel Map
Where inventory actually lives. The efficient channels have friction, and friction is where margin hides.
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Liquid marketplaces (eBay, StockX): priced in, thin margin. Estate sales, storage auctions, warehouse clearouts, local classifieds, thrift (regional), wholesale lots, trade-in programs: higher friction, higher margin. Build routes and relationships, not just searches. The best deals come from the channels other resellers are too lazy to work.