I play Marines with allied Grey Knights. 1300 points or so and counting. Marines are a custom chapter, and when I can afford more termies, devestators and some dreads I'll be using Heed the Wisdom of the Ancients and either Honour your Wargear or Scions of Mars.
Airsoft, are you positive you saw it? Because I just got back from there and not only did they not have it, but when I asked the stockboys and they checked the computer, there was no record of them ever having it. There were just TTGs, RF20s, AT3ks, NFs, and Mavs, and no empty spots on the shelves where the Fireflies might have been.