Alden...
Try Tower Hobbies. They have a full line of Helo stuff :)
If you have a large frame Helo it is probably a '.60' size (refering to the engine size).
Here is a link...be warned, you may end up buying more than you go there for...it always happens to me...lol :)
http://www.towerhobbies.com/listings/listheli.html