nostr:npub1q4zl8v0cpeu0lv47msq2z0jpkr2q3wq5d4ukylxg9sx7t7rcz0uq5ftv7q gets a bunch of them in waves from time to time and they’ll announce it.
Dirt cheap in respects to hash power versus some of these companies offering desktop miners and such.
Discussion
Also, local “conferences” or organized bitcoin gatherings are a place to look for DIY space heater rigs for sale.