Would used cars cost less in U.S? any good sites?

I currently live in Canada but I am moving to Miami this summer. I find it very hard to find cars online in the states.... I often use trader.ca but trader.com simply suck. Another problem is that I am looking for a car I can work on, and most sites don't even include model such as Silvia or skyline. Well... any guidance would be very appreciated. Any recommended sites? and also are prices lower compared to Canada? I see Supras for like 7k here , while 15+ in the U.S sites.