Where can I buy different flavours of skittles?

Ok, weird question, I know, but I LOVE skittles and I glanced on their website and saw that they have a million different flavours but I can only find sour and regular in the shops and only a few more on eBay. Does anyone know where I can find and buy all the other flavours, like chocolate and so on? I'll share them with anyone who can tell me :D