questionsdoes anyone know where i can get luigi's mansion…

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I found one on eBay for about $33 shipped. It's just a single item, not from a business store, but the user's feedback seems okay: http://www.ebay.com/itm/Luigis-Mansion-Dark-Moon-/300915072229. It's the best price I could find.

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Other than used, don't expect big savings anytime soon. First party nintendo games sell at full price or near full price for years. I remember when I was waiting for Super Smash Bros Brawl to release, I was still seeing the gamecube's Super Smash Bros Melee selling for $40 in stores.