Not sure which wave they are from, but I just scored a Skydive (sooo awesome!) at Target, and a Lowlight (even more awesome!) at a Walgreens (I know I paid 11 beans for a 7 dollar figure, impulses you know!)
So is this wave 4, that's what I figure.
Not sure about the waves, but I was SHOCKED to go to my local wallies and see multiples of the whole wave there the other night... First they hardly ever re-stock them and all of a sudden BAM there are all the new ones NOBODY around here has...