Wave 3 is sporadically shipping around here as there's still a large glut of Saga on the pegs of every store, and Wave 1 & 2 back-ups are happening to a VERY minimal extent. Actually it's mostly Obi/R2 from Wave 1, some Mace's too, but the army builders are easier to find as well save for Airborne's and Honor Guards that are non-existant. Marines and Death Star Troopers are pretty easy snags though.
But yeah, other than the odd Vader, there's not much wave 3 to be found. I've yet to get a Luke, and most of Wave 3 I haven't seen in stores even. I'm sure they'll be around soon in good numbers. I even have seen McQuarrie Fett/Trooper recently so even those are shipping a little better.