Where to buy a heel chair (US)

Ok so I live in the US and I tried looking on OfferUp, Facebook marketplace, eBay, and Etsy. All of the ones near me are 800$ look like a toilet (the ones I’m talking about are the ones that come up when you search up heel chair), or the seller just doesn’t respond. Does anybody know where to buy one online.😓 The photos are what I’m looking for.