Game is offering its customers the opportunity to trade-in their DS Lite for £50 in cash or £75 worth of in-store vouchers when they pre-order the DSi online.
The new Nintendo DSi features include a digicam and webcam with touchscreen picture editing, built-in DSi web browser and the ability to download DSWare, such as games and software.
12% slimmer than the DS Lite, the new handheld also offers a 17% bigger screen than the previous DS console, with "improved" speakers and audio capabilities.
"The launch of a new console is always an exciting event", said Alex Croft, MD of Game's online business.
"DSi has managed to pack even more innovation into what was already an inventive portable console. Our customers can't wait to get their hands on one, and if the Japan launch is anything to go by, we're going to see a lot of interest in the coming months".