I agree. Looking at the classifieds, it looks like decently priced grips go quick. I guess I'll just keep my eyes open.
Brian - The diamond center magna and target stocks are harder to find and there is a premium for them - especially the target stocks.
Sometimes you can find them at a local sporting goods or pawn shop, also at some gun shows. Some even go up for auction on Ebay - just do a search for Smith & Wesson grips. Just make sure that you look for N Frame size stocks for your Highway Patrolman.
There are companies that make reproduction stocks, but if it was me, I'd try to find the real thing if I could - sometimes you can luck up on a pair that is in pretty good shape for about the same price as the reproductions.
Good luck,
Gary