You can get TC3 parts just about anywhere. Either on-line or at any hobby shop. Lately I've been comparing prices on a few on-line web sites. GS Hobby
www.gshobby.com looks like they are blowing out most of the TC3 and TC4 stuff. They dont have everything but they have great prices on what they have plus great shipping prices. I'm actually ordering a few items from them today. I've also noticed the Stormer Hobbies is cheaper then Tower Hobbies even with the discounts email coupons that I receive from them.