Ruger 10/22 deserves a good scope as they can be very accurate rifles. I like the
Leupold 4x rimfire scope on mine, but may be a little too much $$$ ? I've also used
a Weaver 4x rimfire scope, and it was really good too. Following is a link for good source for scopes, at pretty decent prices. I've purchased from them a few time, and
no problems.

SWFA: http://www.riflescopes.com/store/default.asp