A used Jaguar can be a performance bargain, but they are even more well known as a luxury bargain. The Jaguar XJ may not be very competitive with the new Mercedes S-Class in the technology department, but a used one is a fantastic bargain. We found a 2011 long-wheelbase model with less than 38,000 miles on it. The car is currently for sale for just $29,847 at Crown Eurocars in Florida. The 5.0-liter V8 produces 385 hp, and the back seat is a wonderful place to sit thanks to soft leather seats with wooden tables that fold down. We can't think of a more comfortable car that costs less than $30,000 and still comes with a warranty.