Buy.com offers the Kensington PowerBolt USB iPad, iPhone, and iPod Car Charger Adapter, model no. K39224US, for $12.45 with free shipping. (Amazon has it for the same price for Prime members.) That's tied with our mention from a month ago and the lowest total price we could find by $2. Features include a LED indicator, 2.1-amp output for iPad charging, and more.