You may have run into TY Pony plushies pretty much everywhere over the past few years. They have a strangehold on the grocery store, gift shop, and general market. Unfortunately they never went very far after the first wave, with only variants to follow. It looks like that is going to change int he near future.
We have three princess plushies appearing from them. Unfortunately only images are up right now. Hopefully we get some more info soon!
Thanks to Rainbow for sending it.