Right.... Select a DS Lite (Any Colour) From Argos, click the Special Offers tab and scroll down. Theres a few deals, but the best one (for me at least) seems to be
"Buy a DS Lite (black - 568/1857, white - 568/0236, pink - 568/2416 or silver - 568/6845) and a DS essential kit (567/8688) and receive any game from the list below free. To receive this offer add 3 items to trolley. Offer ends 13th November 2007."
Games are Big Brain Academy and Brain Training.
Add all 3 items to the basket for the deal which should come in as £119.98.
Until the 13th November, Argos give you a £10 voucher for spending over £100 - which makes the total actual cost £109.98 :)