This looks set to be a fantastic must have game for the Wii and all Harry Potter fans, which will be released in 8 days. (29th June)
The game itself is £29.99 (£34.99-£39.99rrp at most other places) I just added the cheapest thing I could find in stock, being a Spongebob Squarepants birthday card for £1.49 http://www.game.co.uk/ViewProduct.aspx?cat=502&mid=331308
Then used the attached voucher code for £5 off bringing the total price to £26.48.
They do sell batteries for about 48p but they are all typically out of stock, but if you wanted to hold out for them to come back into stock that would make the price of the game £25.47!!
Don't forget Quidco for an extra 9% in cashback!!