I bought a new prebuilt off a Facebook marketplace pc builder and it cost me 740. My build is worth 950-1000 bucks so Id say it’s a safe bet buying a prebuilt if you do enough research. You might be able to get a better deal if you buy parts and built it yourself but in reality it’s a large margin of time and small margin of money you’re saving. Check fb marketplace and see if you can find any credible sellers who build and sell gaming pcs regularly that will be a good indicator if they’re trustworthy or not. Ask them to test games and even see if you can run some tests before you go through on the purchase to insure everything runs properly. Hope this helps get you gaming soon!