I second the "where you live" sentiment... Talk to almost anyone in the Northeast and the Wave 6 ESB figures are pretty scarce here. Hoth Soldiers are non-existant too, when you do find the wave. That's not a "new" wave at this point either. It's been out for a bit now in other areas, but here we are and JUST this past week the first sightings in Pittsburgh occurred... at two Wal-Marts. Nowhere else in the area, has this wave shown up.
Wave 7... Hah. Not even thinking it's in the vicinity yet here.
Target's have basically got a lock on new stuff showing up here at all it seems too. I haven't seen a new CW, Legends, or Legacy figure on pegs at those stores in ages. TRU... They're few and far between so trips to them aren't common. They also never have much.
WM's it, and WM is pretty dry...
I'm not saying to "worry", but I think if you just want a set and see them show up on HasbroToyShop or somewhere, get them there. Unfortunately my desire for extras of Needa, Hoth Rebel, and so on, make it a little more complex for me. Fortunately one of the WM's that got them in I happened upon, but I know others locally who've not seen them at all.