A word about rental cars
Many times, dealerships will supplement their used car inventory with vehicles from rental car companies. The reason is simple: they need the inventory. A dealership can't just sit around and wait for customers to trade in what's popular, so they go out and buy desirable vehicles from rental companies, or at auction.
A lot of people are put off by this, but they shouldn't be. If a car is in good condition it shouldn't matter who the previous owner was. In fact, you may even have a better chance that the vehicle was properly maintained because most rental companies perform regular maintenance.
Rentals will typically have a little higher mileage on them than comparable privately owned cars, but that also means they're priced lower. I have sold many a used car that came from a rental fleet and have had no complaints yet.