For a limited time, American stores are giving away free rumble paks for the DS with copies of Metroid Prime: Hunters!

American gamers are getting another reason to buy Samus' best-selling DS first-person adventure title this summer, as Nintendo are offering free Nintendo DS Rumble Paks with each copy of the game sold. Fitting into the handheld's GBA cartridge slot, it makes the device rumble when players take hits in the game.

Apparently the offer is on now (at 'select' retailers) but only for a limited time and while supplies last. It's currently unknown as to whether Europe will get the Pak free as well when the game launches this Friday, though it is unlikely as we haven't heard anything as yet. We'll keep you posted.

Thanks to Antony Davies @ DSpot for the heads-up!