Since the ATF has sped up the application process, suppressors, particularly rimfire suppressors are in short supply. The Ruger being about as scarce as most.
Otherwise, they never test toward the top or bottom, seemingly like they are OK for their price range. So many brands from about $250 - $600 for a RF model it just takes a lot of research & reading to see what might be best for you.
Then finding it in stock is the next hurdle.