Basic specs would be more useful. Pentium, i3, i5, i7, amount of memory, GPU or not, hard drive size.
Fully loaded Ivy Bridge refurbished business desktops (i7-3770, 8GB memory, 500GB drive) can be purchased for around $250-300 on the average. And in some cases spending that little more on a new OEM PC can be worth it. Those i3-8100 machines are pretty impressive for the money.
Unless you really need the money, keep it around as a general purpose computer. Give it to a family member. Donate it to a local church, shelter, or charity.