Just came across this one which is interesting -
Unfortunately the description is wrong when it says it's "Less than 2 ½ cubic inches" - it's actually 2.4 x 2.4 x 2.4 inches (which is about 14 cubic inches), but for both a 3-way power board and 3 USB (3.6 Amp total) it could still be a good option for some, esp
There's a quote from Anker in the questions stating that it does work with 240 volt, but apparently it's not labeled as such due to some new FCC (!) regulations...
Apparently was selling on Amazon for sub-$20, but it's out of stock at the moment...