The new PS3 Slim is set to be released next week and Shopto are arguably the best retailer to order preorders, as they generally arrive a couple days before release date, so chances are, you'll have this before most people in the country.
They have a great offer at the moment, offering it with 3 games, rather than other sites, who are offering 1 game, a blu-ray movie and a cable, so now there's even more choice available at the same price.
PLAYSTATION 3 Slim--32% smaller, 36% lighter and consuming 34% less power than the original for the energy concerned buyers out there.
Please Note! PS3 Slim is not compatible with PlayStation 2 games.
Hope that helps. :)