Best you can do for parts is just search the various on-line shops. Helihobby seems to be out of stock alot. Tower Hobbies is a good place, too (except last time I ordered a replacement canopy it arrived in a padded envelope totally crushed!) I think it may be a good idea to keep an extra tail motor or two on hand so you don't have to wait for one when it inevitably burns out. I'm not intrepid enough to try replacing the motor with a better quality one yet.

Also, check your tail rotor now while its working to see which direction it rotates. Then you can check the wires before soldering to determine which way to connect them. I soldered mine exactly as the original motor was connected, but they turned out to be opposite in the replacement motor. Result: rapidly spinning UFO on takeoff.