I ordered a Megazord for myself and a Hei Hei for my girlfriend. Here in the UK, Harry Potter is a Tesco exclusive, which is a supermarket and not all stores have a toy section. He's going to be difficult to find and there's no word on where Luna is going to end up. At least in the States you have specified stores and online order for store collection. We're not quite there yet.
I was able to get a lot from the retailers, but I did miss out on some that I really wanted. Lots of variety this year and most were pretty easy to get.