Cheapest price on the net.
Revew: After losing the woman of his dreams, jaded twenty-something Anderson (Jason Biggs) is convinced he'll never fall in love again. But urged on by his best friend, he proposes to a stranger - dissatisfied waitress Katie (Isla Fisher) - and an innocent dare evolves into the kind of love that both have been waiting for all along.
or £7.99 at Zavvi. (a few weeks back it was £7 at HMV instore not sure if it still is though)