Presently the Exige and the Elise are only sold in the U.S. for track use. They can't be registered for the road, due to their inability to meet present safety standards.
The Evora will not be manufactured for sale in the U.S. for the 2015 model year. Lotus' waiver for the advanced airbag federal regulation expired in March. It will return for the 2016 model year.