Doug,
I am not sure about the quality, or who makes them, but Dixie Gun Works sells SAA grips that may suit your purposes.
AP0408 Grips - Single Action Army $35.95
"Two piece ivory grips for replica revolvers. These are much to pretty to use on an old original. Made of bonded ivory, a combination of natural materials with an epoxy base. Material is tough, virtually indistinguishable from ivory, warm to the touch as is solid ivory, and polishes well. You may scrimshaw or add checkering. Grips are made slightly oversized so that they may be sanded and buffed to fit various grip contours. These will fit the 1851 Navy and 1873 Single Action pattern with correct contour for either. Grips shave the positioning pin hole to fit the 1851 ad 1873 with the guide pin. For those 1873 Colts without the guide pin, a wood spacer must be made and epoxed into place. Escutcheon screw included. These will not fit the Ruger."
Here is the link:
http://www.dixiegunworks.com/product...oducts_id=6074