Admittedly, I'm pretty ignorant of FPGA's right now, but I was curious about PCIe based boards a while back and was able to find some moderately priced ones such as
It's around $300, which might not be cheap, but it's certainly more affordable than other I've seen which are very much out of the range of any hobbyists.
https://www.latticesemi.com/products/developmentboardsandkit...
It's around $300, which might not be cheap, but it's certainly more affordable than other I've seen which are very much out of the range of any hobbyists.