Not likely. You’d still have tk buy the rest of it…, and cheaping out on everything., that’s still 50 for the case, PSU, mobo and the cpu is going to go to 100+ very quickly.
Used ram and m.2 cards; cheap everything else… built by a rando… (no offense, OP,) you’d make more selling the ram on eBay or something. (Five bucks, maybe.)