Tried a couple of Toys R Us after reading about the Forza/Pinata and Wireless Controller deal. Although not as cheap, still a good price if you are new to Xbox and looking for an extra controller and a couple of games thrown in. I rang Toys R Us in Merry Hill direct and they had a number in stock. Might be worth ringing round your local Toys R Us and finding if they are doing their own individual bundle deals.
The link I have included is the store locator details.http://www.toysrus.co.uk/info/store_finder.jsf;jsessionid=2BC7BA46D7543D4BE18254E7064BF167.app28