The only consistently good rotation I've seen was between TRU (though they've slacked off) and K-Mart. K-mart being the better of the two and stocking all 3 waves steadily.
Wave 4's not made an appearance here yet, at all.
Target hasn't restocked a TBS 4" figure since Wave 1 here, seriously. Wal-Mart didn't even stock Wave 1 (none that I went to anyway, but one semi-near me did have Wave 1 and possibly 2).
Target did stock up to Wave 2 of the 6" figures, and were first to get the 6" Deluxe. K-Mart has stocked and restocked 6" deluxe figures already though, actually. Target has not that I can tell.
TRU I don't hit often so no clue what's doin' there at this point, and I try to avoid Wal-Mart but I'm usually there on the weekends and they've not had a new toy show since the Maul/Kenobi wave of Mission Series that I can tell.