This week, I believe. I've been tracking one of the six airbills from Taiwan, and they're going through customs in Dallas today.
So those of you that have already ordered, the first shipment should go out by week's end, assuming customs doesnt get overzealous.
As for where to find them.. there are a number of people on here that are Go dealers. Also, check with your local hobby shop...I'll be happy to set them up as dealers!