Hi
We were there in Dec 05, at all of the resort shops I think they had the cheaper ones, they don't have alot of selection (I was looking for a castle charm, none to be found!). I don't know if they have any that are specific to being at WDW. In MK along the left side of main street when facing the castle there is a shop that has the more expensive ones, the two-charmers that have different characters (lady and the tramp for example).
Inga