I used these guys -
https://www.facebook.com/americawest66 and know quite a few people that have (no issues), they are WA based but believe they ship everywhere
As others have said, the challenge is finding the right car (as more importantly, having trust in the seller because at some point you are likely to part with your $ before you take the car). I ended up purchasing via ebay (and private), had all the potential to go pair shaped but owner was good (and identifiable, linkedin etc - was a well know guy, not about to blow his reputation over a 30k)
Summary - my theory is (and flame suit on)
Cheap - go local (coupe, project car etc)
Rare ish - import (race, FB etc - more choice state side)
Expensive - go local (shelby, boss) - the LCT kills the benefit
cheers