When I bought my last car it was actually cheaper new, but it was just coming off the crazy problems with the economy. The used car market was really inflated because new car purchases were down, so less potential used cars coming into the market, and the used car market was waaaaay up because people still needed cars. I ended up with a choice between a brand new Honda at .9% interest and huge discount (Costco partner discount, I got it very nearly at their cost) and a used Honda, same car just the two years earlier model at 4.9% interest. If you count the interest over the life of the loan, it was basically break even on price.
Hondas retrain their value really well so that factored in, if I was comparing any other car brand it probably wouldn't have been as close.