GMRS-X1 is the way to go. A few of my buddies have them (I dont yet).
I think they have seen 2 mile distance seperation so far but I think it is supposed to go to 5 in clear areas
They love them minus of course the normal VOX stuff that they havent really worked out yet.
As for places to buy them I really cant help there cause I am not sure if the places I have seen them do international but I will check.
edit: This is one place but I dont see anything about international. Also check ebay cause I have seen some pretty good deals on there for new units.