If you have other devices going with the Pro, you might want to look at each of them to see if they can run on 220. If they can, just ship a normal power strip with US style plugs, then get an adaptor like this:
I did this when I traveled to the UK and a few places in Europe. My phone charger, camera charger and other various things all worked at 220, so the power bar helped me plug it all in with only a single adaptor.
It's very important that every device plugged in supports 220 though. Do not use a simple adaptor on a device that can only handle 120.