Can you save up and get parts over time, and then learn to build it yourself? You could build a decent PC for as low as $500 (or even lower?) if you look in the right places and get the right parts. Should check out r/pcmasterrace for tips on builds and components, they should have a lot of resources there for you.

Probably some of the more limiting parts would be a decent graphics card, but you might even be able to find a decent one used as people upgrade their parts. Might even be able to find a decent gaming computer used. Check out that sub and see which parts you should get used vs new.

You'll only get financial advice here, so go there for computer advice.