The ownership of indigenous deer species parts (i.e. whitetail, mule, etc.) is dependent on the state so it's best to check your state game laws as they vary.
Sambar stag was never outlawed in the US - it was India who banned the export, that ban has been relaxed some so that it is much more avalable, but it's still often pricey for the good stuff, on the other hand what is now considered the good stuff is the popcorn and other gnarly stuff, which isn't as fitting for PC stuff, so the PC stuff is more reasonable in price.
BTW - the period Sambar stag was heavily soaked in Potassium permanganate as a bug control measure - so if you want the color to match than that's what to use.........to keep the piece looking good neutralize the PP