1. 2013 Smart ForTwo Cabriolet
Last but not least, the cheapest convertible available today is the Smart ForTwo Cabriolet, priced from $18,640. Unfortunately, the Smart ForTwo might be missing everything a convertible needs to be fun. With a tiny 1.0-liter engine powering the ForTwo Cabriolet, you’ll get a whopping 70 hp and 68 lb-ft of torque. But then again, the ForTwo is a tiny car that’s nimble weighing in at only 1,852 lbs. As for fuel efficiency, the ForTwo does get 34 mpg in the city and 38 mpg on the highway, so it’s got that going for it.