I like to shop for rentals using the
CarRentalSavers website. They have lots of options for potential discounts (location, group affiliation, etc).
Once I find a good rate, I go to the company's website and rent directly from them. I always find the same rate, and sometimes can add coupons (like those found on
MouseSavers to bring the rate down more.
Oh, and I prefer to stay with the large chains/companies and personally prefer
Avis due to their relationship with USAA, otherwise I enjoy the National/
Alamo group.