I was watching that one myself because it was outside Tinker AFB. If you want a M6 - they are in short supply!!! There's only one that is shown left in the DFW metroplex. I just use my map program to find zip code so major metroplexes and use the locate vehicle on pontiac.com.
EWING BUICK/PONTIAC/GMC TRUCK
4464 W PLANO PKWY
PLANO, TX 75093
There are 2 yellow ones and 2 red ones in south Texas - search 77449. Remember that the M6s are 33,190.
I tried Colorado 80652 and found one silver M6 with black leather
GRAND AUTO, INC.
2000 W 104TH AVE
THORNTON, CO 80234
good luck. It looks like most deals are around 25 to 26K unless you have the GM loyalty discount.