Remember the days when people who wanted to sell their car privately had to buy a newspaper listing, hang up a flyer on a bulletin board or telephone pole, or park the vehicle in an abandoned parking lot with a For Sale sign? The only thing tougher than selling a used car back then was buying one.

But in the 21st century, the Internet has fundamentally changed the way people buy and sell used vehicles in America. And there is no shortage of sites that provide these services. Here are the 10 best ones out there today.