Normal people can’t buy shares of OpenAI or Anthropic ahead of the companies’ looming IPOs. So some are buying into a different kind of secondary transaction: used t-shirts and hoodies that were doled out to employees or conference-goers as a perk, that are now reselling for hundreds of dollars.On eBay, there’s a bubble in AI company swag. Recently, boxes of OpenAI Codex swag consisting of a hat, hoodie and a few small tchotchkes, were commanding as much as $475. A used OpenAI sweatshirt, $246.99. An Anthropic-branded pen sold for $39.99; An authentic employee t-shirt from the $956 billion AI company, fetched $120. “I do think these are the vintage concert rock shirts of tomorrow,” says Mitchell Brody, who operates a t-shirt shop on eBay with his college-aged daughter, Sunny. They’re currently selling an employee-issued OpenAI t-shirt for $249.99. “It’s geek chic. There’s going to be a day when people brag about the OpenAI double stitch shirt they got in the roaring twenties.”Forbes spoke with sellers who have recently sold AI company swag on eBay, who confirmed that it, particularly OpenAI and Anthropic items, is going for many multiples above other types of company swag. On Brody’s shop, for instance, an employee tank top from tech stalwart Google is listed for $24.95. Even SpaceX lacks the new AI swag hotness premium—a legit company polo is priced at $11.92. It’s another bubble inside the bubble.“There’s going to be a day when people brag about the OpenAI double stitch shirt they got in the roaring twenties.”