Looking for x86 recommendations

Hey all!

I've spent a couple of days skimming the web to no result, and was wondering if anyone could provide a suggestion?

I have an old (donated) USB audio interface, which has a Linux kernel module, but only runs on x86. I was hoping to make a little project out of it, and see if I can run it from a mini PC.

I'm hoping to find a low-cost x86 option to run this, and realize that that factor will make it inherently a little pricier. Are there any common, older models I should keep an eye out for on the used market?