With the DSi coming out tomorrow and people moaning that its overpriced (to an extent) then I would like to help people get a better deal.
Anyway, here's how it goes:
Nintendo DSi + Accessory Pack + Puzzlers Game @ Gamestation INSTORE for £149.99
Gamestation offer £10 trade-in for the Puzzlers game (I'm not sure how much you get for the others but as a guidline this is probably the easiest example - they sell mahjong ds for £12.49 so probably worth less, carnival games is old and crap so probably not worth much either)
Anyway trade it in and buy 2 £4.99 pre-owned DS games with it.
Then go to game and trade those 2 games in and go with the 'Trade in 2 ds games get a new one worth £29.99 or less for £4.99 offer' . Pick your game.
And there you have it.
A DSi with a decent game (of your choice) for £154.98 or if you can find a DS lite for less than £75 (theres one for £65 in my cash converters) then you can save even more.