Wow.
I surprised you guys actually care about the $0.30 difference between suppliers. I mean, most people are only looking to buy a couple of them, unless they plan to sell them pre-programmed. And if you go that route, the price difference between places is like $0.05. Either way, its piddle. The shipping costs between Digikey and Mouser and Allied is somewhere in the range of $8-$15. That makes more of a difference even if you buy bulk.
Pick the place that has the OTHER stuff you want to purchase also. Like say switches and resistors and LEDs.