
I have bought them from several different sources. I suggest typing CRIMSON TRACE in your search engine and go from there. The price didn't differ much buying off the net or buying from a distributor at a gun show. You can expect to pay approximately $275. for a set of grips for the Sig. Costly, but worth every cent.
I was opposed to them at first, but after shooting a friend's gun, I fell in love with them. I now have them on five guns. What is nice, you don't have to look down the barrel like looking through a scope, or using the sights. I can tuck my 220 into the hip with a good two hand grip, keep both eyes open and watch the red dot in the target. This is great, you have both eyes open and a much better field of view than when using sights or a scope, and once zeroed they are really accurate. You can't beat them at night or in low light conditions.