Ya you can. Google Caterham USA. Yeah, I saw the caterham r500 on topgear and I want it!! I looked into it and the US versions are expensive. $60k Not worth it here in the states. In europe it's only like 20k pounds. Considering a corolla in Europe costs about 15k pounds and a Honda civic about 16k pounds, it's well worth it. My next car I plan on building up is an FFR AC Cobra. It's a kit car but they rock.
Www.factoryfiveracing.com. Check em out. For 30k. You can build an awesome car. But base cost is like 15k more of less.
But regardless, the caterham r500 is awesome.