Just been down Blockbuster, and they're selling Beowulf for the PS3 (a relatively new game) for £19.99!
Now, I haven't read reviews or anything, but Find-Dvd.Co.Uk has come up with £39.99 as the next best price.
Seems like a bargain to me, personally.
(Btw, I know the shop is called 'Blockbuster' but some people might search for 'Blockbusters')
Hope this is of help to someone!