Here's what I've seen around town recently...
K-Mart: ANH wave & AotC wave
Target: ANH wave (no Chewie/3PO pack though) & BH wave
Wal-Mart: ANH wave
TRU: ANH wave, AotC wave, BH wave
I have not seen the Stormtrooper 2-pack yet, but I think that's in teh wave 3.5 cases (a case assortment with pretty much 1x each of the sets so far).
Alos, in a lot of the Target stores I've been to, the GH figures are always in the "other" Action Figure aisle (not the main AF aisle with batman, SW, GI Joe, etc). They are mixed in with the McFarlane figures, Ninja Turtles, etc. One Target even has them in the aisle with the Rescue Heroes. Be sure to hunt around your local Target to make sure you aren't missing them!