Check out Discount Electronics.
They are out of Austin and basically buy PCs from companies that upgrade every few years.
They buy them cheap, fix any issues and sell with 1 year warranty.
I have bought a few kids laptops and a desktop PC from them.
https://discountelectronics.com/Here is a Windows 11 Desktop with 8 gigs Ram and 128 Gig Hard Drive for $250
https://discountelectronics.com/lenovo-thinkcentre-m720q-tiny-desktop-pc-windows-11-mini-computer/Here is a PC, keyboard, mouse, and 22" monitor for $255...
https://discountelectronics.com/clearance-dell-i5-desktop-computer-package-22-inch-monitor-keyboard-mouse/Here are Laptops for about $300
https://discountelectronics.com/laptops/?sort=priceascYou can spend more on faster systems, you can upgrade the RAM or hard drive as well.
A Windows license is $150 retail, so anything under $300 is a heck of a deal...