A "basic" Windows 10 laptop at Walmart is about $220.
https://www.walmart.com/ip/Lenovo-ideapad-320-15-6-Laptop-Windows-10-Intel-Celeron-N3350-Dual-Core-Processor-4GB-RAM-1TB-Hard-Drive/55731619
Windows 10 license is $120.
https://www.walmart.com/ip/Microsoft-Windows-10-Home-Digital-Code/46937526
However, you may need to upgrade parts of a Vista computer to get it to work. It is less of a headache to buy a new laptop preloaded with Windows 10.