Reindeer is the same as Caribou
In Canada, they are in the far north.
In Canada there are restrictions on selling game animals or their parts - designed to slow down poaching for example bear paws and gallbladders for Chinese boner pills.
Try finding some northern Canada or Alaska contacts, preferablely the native Eskimo,or whatever they call them now - no game limits -no seasons - seemingly no restrictions on selling them.
Or see if you can find a local farm that raises them domestically,
http://ggreindeer.com/AboutUs.html
Why are you stuck on reindeer instead of any antler?