Smyth Toys have nintendo DS lite for £99 with a free game (sims 2 or fifa 2007) available in most of the Smyth toys stores - this is a pick up only service and you can not reserve it
I got mine today from the store in Salisbury and there were loads of them in there, all colours.
They seem to have regular stock just check their website for availability, they are also open late (until 11pm I thinks)
Just a shame they don't deliver ;-(
Sorry if I have done this all wrong - it's my first post ;-)