Just got back from Cardiff Bay Toys R Us and bought 2 Wii Fit's - 1 for me and 1 for a friend. Staff there are saying how amazed they are that they seem to have PLENTY of stock. One girl even said they had LOADS of stock.
I don't think they will let you bulk buy - the 2 I bought had to be paid for in separate transactions.
My advice: get down there as fast as you can!!!!
I still can't believe it - I am so happy!!! I had been trying all day to access their website, which is closed for maintenance. Made my day anyway. Let's hope loads of you manage to get down there.