Elk is what I like to use. Color depends on shed/shot and how deep into it you cut....but it can be altered as well. It just depends on what your customer is looking for.
I like the way it machines, the way it plays, and the way it looks!
You could buy it off ebay or maybe from some cuemakers here on AZ. I have plenty of stock for joint size, just not sure what I have for butt cap size.