flyingcheesehead
Touchdown! Greaser!
This is what I use. For $2.06 including shipping, it is almost free.
Fits pretty flush.
http://www.fasttech.com/products/1154/10000315/1035501
Nice and tiny, specs say 12-24V, but the 2nd port is only 1 amp. Not quite perfect yet. Now if they can get both ports up to 2.4 amps and give it away for free, it will be.