Best
Kayak:
Best car rental aggregrator search engine. Multiple travel websites are searched at the same time.
Big Name
Orbitz:
Best car rental search engine. Matrix display lists prices from all major car rental company with all kinds of car. Very clear.
Travelocity:
Their Total Pricing service not only list the basic price, but also the tax & fee, and other charge.
Expedia:
Biggest name but may not be cheapest.
Sidestep:
Searching multiple websites webs directly and get the best deal.
Small Rental Service
Car Rental Express:
Search over 300 independent car rental agencies that operate out of over 1,500 locations worldwide. Daily or weekly rate 15 percent less than the national agencies.
Bid
At big cities, using Priceline or Hotwire to bid a car usually offer you a good car rental deal.
Hotwire:
Know the price before you buy.
Priceline:
Bid the price, win or lose. At big cities, bidding a car rental at priceline could save you up to 25%.
For your biding, you must check Bidding For Travel and Better Bidding message board to see others successful biding price as reference.
Car Rental Consolidator
Rentadeal:
Car rental consolidator. Offers the easiest and most affordable way to rent a car and many other types of vehicles at airport locations
Car Hire 4 Less:
Car rental consolidator for Alamo, Hertz, Budget, Europcar. It claim rate 30% lower than the competition with no hidden fee.
Limousine Line:
Lowest limousine service worldwide. Bid the price that you're willing to pay. A limousine company in the area for which you need service will contact you if your bid is accepted within 24 hours.
Booking Buddy:
A free tool designed to help you search more than 30 travel websites with only one input information. Recommended.
Car Rental Checker:
The tool courtesy of BetterBidding. Help to check Orbitz, Travelocity and Expedia car rental at the same time.
