Haswell i5-4570 SFF pre-built OEM refurb PC, 8GB DDR3, 500GB HDD, Windows 10 Home,
$110:
www.newegg.com
GTX 1650 low-profile
$160:
www.newegg.com
Patriot 16GB kit of DDR3-1600
$65:
www.newegg.com
Note that the RAM evidently, is on tomorrow's ShellShocker list, so it could go cheaper tomorrow.
I actually
just bought these three things, with my stimulus check. Gonna build some $350 gaming PCs, and try to flip them for $450-500. (Will add 480GB SATA SSD as well, which I already have.)
16GB DDR3, GTX 1650, i5-4570, should be decent for gaming, if not as great as a lower-end Ryzen rig with an RX 580. (Which will run you around $600-700 for parts, "new".)