It's not as easy as buying some ready-made grips. You can't really get off the shelf grips for most single action revolvers, because individual grip frames vary, and the grips need to be fitted to your individual frame. If you are an experienced woodworker, there are lots of grip makers online who will sell you a set of slightly oversized grips in almost any wood you desire, for you to do final fitting and finishing.
If you don't want to be required to finish the grips yourself, your next best bet is to send your revolver frame to the grip maker so he can properly fit a set of custom made grips. Since it's a BP revolver shipping is not a problem; you can send the revolver yourself and receive it by return shipping. A custom made set of wood grips, fitted to your revolver, will cost you about $200.
I have two revolvers with custom fitted grips, and I do not regret the decision at at all. They are both among my favorite revolvers to own and shoot. They definitely stand out from the run of the mill revolver.
Chaz