This paper uses the open-source Rocket-chip processor (<a href="https:&#x2F;&#x2F;github.com&#x2F;ucb-bar&#x2F;rocket-chip" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ucb-bar&#x2F;rocket-chip</a>), which is the same processor being used (and modified) by lowRISC. So hopefully  you can buy RISC-V in the not-to-distant future!