How much?!
For that price you may be better off with a Power Monkey
http://www.play.com/Electronics/Electronics/4-/9159324/Powertraveller-Power-Monkey-Classic/Product.html?searchtype=allproducts&searchsource=0&searchstring=power+monkey&urlrefer=search
Fair enough it doesn't handle 3 USB devices at once, but the plug wart's interchangeable mains adaptors are good, the bag of bits will suit most needs in the small mobile device arena ... oh and I almost forget, there's a rechargeable battery device for use on the go.