There’s a 2000 Smart Car for sale on Ebay, which appears to be legal in the US. Colorado registration, 12.5K miles. No mention of the EPA/DOT paperwork, but you can email the seller for details.
We’ve rented a Smart in France, and we beat our heads against the Smart dealership wall in Nice for several days, trying to get them to tell us how/why they helped Sally Jesse Raphael get one into the US, but they wouldn’t help/tell us. [But isn’t it because she was a star, you ask? Non. Any one of us is arguably more famous in France than Sally Freakin’ Jesse Raphael.]