It was a gloomy Tuesday afternoon in Portland when my latest StockX order arrived with a thud that shattered more than just cardboard. Another pair of mislabeled Chinese factories, another $80 markup for a product I could have sourced myself. That’s when my friend, a streetwear collector in Berlin, introduced me to the holy grail: the mulebuy spreadsheet. This simple Google Sheet, maintained by a community of frugal hypebeasts, lists verified Chinese suppliers with direct prices. No middlemen, no mystery fees. My first experiment was risky. I bought a pair of Nike Dunks from a supplier listed on the mulebuy spreadsheet. The total, including shipping, was $45? That’s less than…