This is the cheapest I've been able to find it. It's priced at £39.99 at most other places though Play.com do offer a free beta key for Uncharted Multiplayer. I couldn't care less about the beta though so going to pick this up.
It's worth noting that shopto are also selling the special edition version for the same as Play are selling the standard one.
There is also currently a voucher for £1 credit for the first 2000 people who use it. Not sure if it's still available but it's posted by amibees at http://www.hotukdeals.com/deal/385768/free-1-voucher-no-minimum-spend-sho/.