Big Brain Academy for the Nintendo Wii is £14.97 @ Toys R Us.
Online purchases have a delivery charge, but there should be stock in store. I was in the Swindon store the other day, and they had it is stock - price at £15 I think, not £14.97 - but probably best to phone before going in.
This seems a really good price - most others are £20 upwards - only closest is Asda/The Hut @ £15.97, but this is 'on order from the suppiers', with a 2 to 4 week wait.......
Hope this is of help to someone :-)