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Code also works for accessories and games. It will only give you the discount for one item in your cart so you will need to place multiple orders to use it on multiple items.

ETA: Looks like you don't get free shipping on the accessories and games though unless your order is over $129.

Remember that the DSi (next generation DS) will be released soon, and has different features from the DS (2 cameras, both screens are touchscreens, smaller, external flash memory support, etc.. One setback is that DSi cannot play GBA games, whereas the DS Lite can).