https://nerdminers.com/

which are unable to join pools, so they are more vanity miners.

This might be of interest, it uses the BM1370 ASIC from the S21 Pro miner:

https://www.nobsbitcoin.com/bitaxegamma-5th-major-revision-with-bm1370-asic-from-antminer-s21-pro/

It seems to have a lot of hash power for the power consumption and may be worth the investment over time.

Not sure about hooking it up to 12V or 24V, sorry.