Then check what Blokforge.com has in stock. They are in Mesa Arizona (even have walk-in a store there) and primarily carry new gear but have some used gear  from time-to-time. I've used them since 2017 for all of my new gear purchases (primarily Avalons) and they are excellent folks to work with.

Oh ok. Boutique mining. Well you could do an Antminer S9, they're pretty reasonable and putter along. S15's are not worth it for the price, S17 and 19 are neat but expensive and require 220v. Dragonmint A1's are good but man they blow up easily. Older miners (Neptunes, S7, that kind of thing) are not going to make you any real coin.

If you just want something in the corner of the house an R4 is nice. If you just want to see BFGMiner run and mine some dust pick up a cheap Jalapeno and run it on your desk.

But with ATMs all around the quickest way is to buy it. But mining is fun....

If I might ask, why?