Just found this on the Play website - cheapest that I can find at the moment on the net - might still be reduced in some ASDA/DSG Group stores, but hey, this is cheap aswell!! (Still cheaper than most places)
Don't forget 2% quidco :)
"While inheriting the basic functions and design philosophy of the current PlayStation 2, the internal design architecture has been completely overhauled, resulting in a slimmer and more lightweight design. Internal volume has been reduced by 75%, overall weight has been halved, and thickness trimmed down to 2.8 cm (thickness of current model is 7.8 cm). Its size is almost as small as a hardcover book, making it easier to carry around and enjoy games and DVD videos anytime, anywhere."