I have bought over a dozen sets of elkhorn from Grashorn ("Executioner"). Don't know his current price. Had them on 1911's, several Blackhawks and Vaqueros, Colt SAA, and others. Have had several sets from bighorn but the supply is limited.
You order them and he will send you a picture for approval. He has done exceptionally well on matched pairs for matching revolvers (My Pythons, SAA's, etc.)