TQ carries multiple kits from TOP so I doubt they will stop carrying them. TOP Racing USA also just put up a site for end users..
http://apexhobbies.3dcartstores.com
You can buy parts there as well
ApexHobbies does not seem to ship their products, ...they only sell for "In-Store" pickup. I've also sent three emails over the past month w/ zero reply. Checking them off my list.
Fortunately the part I need can be had at TQR.