Cost effective PC to run Bazzite

I am looking for a living room gaming computer to use with my projector (HD, non-4K), and just found out about Bazzite.

I don't need the PC to do much more than run Steam. I am not super tech-savvy, so I am struggling to parse all of the available systems/options. I don't want to break the bank, but also want games to play well. I am (obviously) not a competitive gamer, but do play some online games so would want it to be able to handle those demands.

Any suggestions for out of the box solutions? I know building a rig is the cheapest option, but again, I am not super tech savvy and don't want to buy all the parts and then eff it up by shorting out the motherboard.

Thanks!