While it used to be $10 (or Free with a Metroid Pinball purchase) you can now get the DS Rumble Pak with purchase of Hunters. From the release: “Nintendo is shaking things up this summer by offering a free Nintendo DS Rumble Pak? with the purchase of Metroid Prime Hunters for Nintendo DS… Free Rumble Paks with Metroid Prime Hunters purchase are now available at select retailers for a limited time and while supplies last.”
For pak owners, would you recommend it to others for a heightened game experience?