Oh don't worry...the deal will pop up somewhere else (B&H, or adorama again...etc)... this is called a "managed slide"
... low prices will pop up breifly, but then go up again, repeat the cycle, all along moving down till the body price hits probably ~$2500 stably. Lets not forget, it has already hit that ...but went back again. You just have to wait till they bring the baloon down slowly
But the amazon deal would have been a fair buy if one had been in the market for a 5DIII. But like I said, Just wait, same or similar deal will be back soon.