Ah. I missed that. But 2G is entirely too low for current games. Get something with 4GB at a minimum. A 570 as you initially mentioned would stomp all over the 370. And you should be able to find one fairly cheap. You could probably even find a 580 for not much more. If you can swing it, the 580 or 590 would be tits.I currently have a Rx 370 2g but like I said Forza and other games have started to crash a lot.
I got my GTX 1080 for $300 around Christmas 2019 (maybe January 2020). No it wasn't brand new.
It was gently used (no mining) by a buddy who sold it to me for a RTX 2080 Ti.
I don't mind cards used for mining. I would argue that they're typically treated better than cards used for gaming. They're usually underclocked, ran with much better cooling. In my mind, people tend to treat things better when they'll a source of income vs a toy. I'm pretty sure that the 1080 that I had prior to the 1080 ti was used for mining, and I wouldn't be surprised if my ti was too. I don't even bother asking.