See, now this is one time that regional distribution f-ups worked out in PIttsburgh's favor, and other areas actually were SOL for once.
In the area here, I'd say I saw them a number of times full price at various WM stores, however a short time later on (when ROTS was seeing clearances at WM stores) I saw a large number of Sep. Twins sets for a mere $3 each... I kid you not. They were quite abundant here and for half price to boot, so I don't personally clump them into the rare column...
It seemed like the East Coast lucked out on something for once while other areas didn't do as hot with them. Very weird...
It goes to show why I hate WM and exclusives though. To me they're no better than Target for reliability. TRU's been the only store you could really count on to get stuff in and keep it in.