So much for that Amazon exclusive until September. Maybe it's primarily for the other figures in the lineup that aren't appearing anywhere yet? Nightmare Moon and Celestia have been spotted at Walmart. This marks the first major retailer outside of small nerd-culture sections at Barnes and Noble and Gamestop.
Amazon still seems to be the only place for the rest of the set outside of the three we are seeing everywhere. You can still get all the figures over here with a release of September.
Thanks to Xander for the image!