I remember the first time I stumbled across a spreadsheet that promised to change my shopping game. It was late at night, and I was hunting for a pair of Margiela Tabis that every reseller had jacked up to triple retail. That spreadsheet was a tool called mulebuy spreadsheet, and it opened a door to China’s factories and markets that I never knew existed. Living in Austin, Texas, as a vintage consultant and part-time thrift flipper, my budget is tight but my taste is expensive. I’ve chased hype at StockX, paid duties on Grailed, and even flown to Tokyo for second-hand gems. But nothing compares to the raw value of…