For this specific RISC-V variant, it seems like it requires relative expensive FPGAs. There are some other RSIC-V cores that you can play with which run on small and cheap FPGAs. I’ve played with the picorv/picosoc project on a TinyFPGA BX and those are easy to find (recently sold out at some shops but crowdsupply still has some of you can’t wait a month for the next batch of boards) and cheap.

There are also a lot of new FPGA dev boards with good community support for folks looking at getting their feet wet, like the icebreaker (crowdsupply) and alchitry (Kickstarter).