Well, on Amazon I searched for multiple USB charging ports and I found:
http://www.amazon.com/Cosmos-Adapter...sr=1-2-catcorr
The user reviews say it is capable of 2,000 mA (2A) on a single port. I'm just not sure if it can deliver 2A on all ports simultaneously. Biggest complaint seems to be that it has a blue LED light that is too bright at nighttime in the bedroom.