There are several websites dedicated to helping you find the best price for a car rental. Autoslash.

Traveling cheaply is more difficult when you run a small business: You can't get steep discounts through a corporate rate and you (and your employees) probably don't travel often enough to reap the benefits of a rewards program.
Car rental companies always ask if you want to insure your car rental. Most of the time, you don't need it. (Chris McGinnis, a business travel expert w hotel and editor of hotel chain Best Western's YouMustBeTrippin.com blog, told MyBusiness magazine that car rental agents are paid a commission for the insurance they sell.) w hotel Instead, call the insurance carrier on your personal vehicle or business fleet to make sure you're already covered. Homeowners' policies and the credit card you use for the rental may cover the driver, too.
Only need a car for a few hours, or less than a day? Try using a car-sharing w hotel service, which is often cheaper than a rental company. ZipCar, for instance, has cars available in almost 100 U.S. cities that come with gas, insurance and up to 180 miles of driving. Some ZipCar plans require an annual membership fee of $50 to $60. Certain metropolitan areas have their own car-sharing services, too, like iGo in Chicago and PhillyCarShare in Philadelphia.
There are several websites dedicated w hotel to helping you find the best price for a car rental. Autoslash.com automatically rebooks your car rental for a lower-priced option up to your pick-up date. Priceline.com and Hotwire.com offer substantial discounts—but you won't know the name of the car rental company until you book.
If you're traveling to a major metropolitan area, or simply need a ride to and from the airport, consider forgoing w hotel a car altogether. Look into the prices of alternative transportation, such as taxis, buses, shuttles and trains, to get around. Before you leave, do a cost comparison: Determine the cost of car rental and parking vs. the cost of a shuttle from the airport and subway tickets.