Well, my TRU usually stocks pretty well for most minimates, including the WD exclusives. But they've only put out 1 case of wave 5 and that was well over a month ago, maybe closer to 2. I'm fortunate a friend found them and got us both a complete set. The straggler dupes in the case lasted maybe a day longer.
I'm sure they will show again, but there seems to be a BIG lull in the minimate section now.