CFS3 is wierd, sometimes you can't move for it in computer stores, and other times it's like trying to find rocking horse crap. Which is usually the way when you go to buy some software.
Play deliver stuff pretty quickly, usually 2-3 days. They are usually a bit cheapper than most places too, because they are based on one of the 'tax haven' Channel Islands, so they have an exemption from some UK taxes on stuff.
Chock