Is 57 usd a good price for an OG XBOX crystal edition?
There are actually 2 kind of those consoles going for 57-60 usd in allegro (Kind of like ebay but for poland). Just wondering if this is a good price for them. Might buy one if its a fair price.

I'd say that's pretty reasonable. A standard Xbox would probably be around 30USD, and while the price you're quoting is twice as much, it is a rare variant.