Buy.com offers the Kingston 16GB Wi-Drive WiFi Storage for Apple iPad, iPhone, and iPod, model no. WID/16GBZ, for $99 with free shipping. At $6.18/GB, that’s the lowest total price we could find by $3. The Wi-Drive provides an additional 16GB of media storage, via 802.11n connectivity, for an iPhone, iPod touch, or iPad. It can be shared with up to two devices at once.