This is not an ad or sponsored post I promise. I am just a big fan of AutoSlash.com. You simply enter your city or nearest airport and it will do a search for cheap cars. You can can also tell it what kind of memberships you have so it can try to use them for discounts. I’ve been using the site for over two years and am very happy with it.
You can Google other methods to find cheaper rates but this has been the best method for me. Picking up a car tomorrow for 26$. Give it a try.