

eBay (US) like a week ago. I got it for $125 but they were going for under $100 before I heard about them.
I don’t think you can buy them new anymore. All the stock I’m aware of are from decommissioned crypto-mining rigs and being sold secondhand.
I included an eBay search link in the Resources (https://www.ebay.com/sch/i.html?_nkw=bc-250) and just checked it. Looks like they jumped in price again and are $180+ now.
Assuming you’re in US or Canada, here’s the listing for the one I bought (same seller). It’s the least expensive at $165 with $16 shipping. Some listings include the SSD, so that may be why some cost more. Basically I think the cat is just out of the bag and now that people have found an easy way to repurpose these, demand and price is up.

























I’m with David Mitchell, and the hill I will die on is hating the phrase “could care less”: https://www.youtube.com/watch?v=om7O0MFkmpw