I bought mine from AM....their service is outstanding. As Spiney said, the tuners are pretty much the same price everywhere but the free tunes for life is a big reason to go with AM.
2013 Mustang GT/CS: Black On Black/6 Speed MT/BAMA 91R Tune/Glass Roof/Electronics Pkg/Comfort Pkg/3.73s/Roush Axle-Backs/C&L CAI/JLT Oil Separator/Tint 30/5
Gripping the wheel, his knuckles went white with desire! The wheels of his Mustang exploding on the highway like a slug from a .45. True death: 400 horsepower of maximum performance piercing the night...This is Black Sunshine-White Zombie