An opinion on available stag in the FWIW Dept:
Good seasoned Indian Sambur stag is durable, feels good, looks good, and some facilitates maintaining a good grip. The key is to look at the grips before you buy since any given importer's stag varies in thickness, fit to frame, and dramatically in figure. If you don't see a decent selection in your local area, you don't have much option but to order and try to specify what you're looking for. Good luck.
Especially as supplies have gotten shorter, much of the stag offerings look little different than bone, but the prices don't reflect that. Some stag has dished out areas which if they're in the wrong place can adversely affect grip and balance, some are undersize and some are oversize as far as fit to frame goes, and some have some grotesquely sharp edges (the latter two problems, of course can generally be resolved with a bit of hand work, but there ain't a lot of cure for the former two problems).
Personally, I'd recommend checking the grip dealers at every possible gunshow and trying to work out some sort of deal--particularly if you're interested in a certain specific look (which is the reason most folks opt for stag grips). I've finally given up on ordering stag based on some of the selections I've received over the years and am willing to pay a bit more to get the stag I want after I've looked it over.