I'm not sure if there really are any affordable FPGAs that are capable of running a RISC-V core with anything even approaching desktop performance. You'd likely

I'm not sure if there really are any affordable FPGAs that are capable of running a RISC-V core with anything even approaching desktop performance. You'd likely struggle to get even original gen 1 Raspberry Pi performance out of anything in the sub-$100 range. I'm far from an expert on FPGAs though and have only dabbled, so if anybody knows differently I'd love to hear it.