The Nintendo DS - Accessory Bundle - 17 in 1 Bundle Pak includes
a waterproof case for your Nintendo DS.
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Yes, Nintendo makes car chargers for the Nintendo DS, as well as
several 3rd party companies. For a complete accessory package,
check out the Nintendo DS - Accessory Bundle - 17 in 1 Bundle
Pak.
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The AR stands for action replay which is basically a cheat
enhancer for the Nintendo DS. It is sold separately (unless you buy
a Nintendo DS in a bundle with one, of course).
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The savings for a Nintendo DS bundle varies depending on the
bundle and the games contained inside of it. For a definitive
answer, one must compare the price of standalone games to the price
of the bundle to determine savings.
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The Nintendo Ds is on sale at this time. $149 for the bundle or
$129 just for the system.