Ok, I'm honestly gonna suggest you to build your own like i did, and i'm sure everyone here will suggest the same.
Use "pc partpicker" to verify compatibility, if you really dont know how to build a PC and dont think you can, you can ask someone else and they'll take a flat price for their work and ship it to you.(contact for more information)
If you're really on a tight budget, couple hundred of dollars will get you a pretty decent budget build computer but the problem is that right now prices are extremely high, wait a couple months for new releases as crypto miners would buy those and it would lower the price for you.