J-man had a good suggestion and now that I know what they are that is what I will be using for various props in place of the reindeer motor. But if you still want a reindeer motor you can get them at Fright Props, Monster Guts and Kindy's Factory Outlet.
They're everywhere. eBay. Amazon. Don't look for "reindeer motor", look for "synchronous motor" and you can find them by the ton, sometimes for around $5 each. You'll probably have to add a plug, which is sure cheaper than you can get the whole thing from Fright Props, which usually charges $15.
I use the $5 motors on ebay but they don't come in the water tight housing and you have to add your own plug and they do get hot to the touch. Here's the prop made from one of those ebay motors . If you don't weld make sure you get the motor with a threaded post.