Roches Stores were stocking branded ones (e.g Jungle Book, Winnie The Pooh etc.) recently but they seem to be running out of them and not getting more in as far as I know.
We got these stickers in Dairygold (4homes) in Limerick. Got Barney and they come off if you put a hairdryer up against them and don't mark the walls. They cost 17 euro 2 years ago for enough stickers to do a small childs room.