Free: Contests & Raffles.
Plinking, hunting what do you want to do with it?
The ruger single six and Mk II are good. With the revolver you can even get a spare cylinder for .22 mag.
sig mosquito
He suggested the Ruger SR22 over any of the others that were in its class, like the Sig or Walther, because they seem to reliably eat anything they feed it. I ended up buying neither.