n10, ebay the best for quick purchase, and at least with pictures you can see what you are getting. Try the trader board here WTB section. Then haunt the little parts boxes at gunshows. I have a box I set out at gunshows, guys who know me go there first to see if anything new (always is) then check out the rest of my table. Another source is older gun shops, a lot of times they have boxes of "take offs" that they will let you paw through. I have bought scopes with the rings I wanted and sold the scope later for the same price - Free rings. Remember the bases and rings used were just commercial pressed into service. Early blued, later parkerized, both correct. Just gave you a lot of secrets - will probably be thrown out of the Secret Sniper Club!! Good Luck - Skid