George at Murats used to special order me bucktails in bulk. Now that he's closed the shop , we have been getting the bucktails through Smokey's brother. I have no idea where he gets them. I just get a big bag full handed to me.
SOL used to sell "salt water grade" bucktail. They were very nice with extra long hair. I don't know the cost. If you only need a few , try there.