I have a GMG and love it, use it weekly. I just did 2# of ground jerk/snackk sticks Saturday. I would love to have a DC though as much of my cooking is burgers which is is very good at, even with sale though just can't do it. The DC yes does have 12VDC, it is designed as a tailgating unit, in fact it is a 12V unit and they supply a convertor so you can use it 110VAC as well...
I have heard sportsmans warehouse carries GMG, but have not seen it up here in WA.. Maybe use this link to find a local dealer..
http://greenmountaingrills.com/find-a-dealer/That site will also have more info on the sale etc.