For diecast, I deal with
www.tommytoyz.com often and he has the usual ERTL contacts. He's big on musclecars.
BTW, ERTL just released a new Baldwin Motion 1970 Camaro. It's a Toys R Us exclusive. The ERTL # is 32810 and the TRU stock # is 206086. Here's a pic of it....