Slash car-rental cost

Do you scour the Internet looking for car-rental deals, only to spend time idling your engine and wondering whether you could have found a better price if you had waited a bit longer?

Name: AutoSlash.com

What it does: After you book your car rental with AutoSlash, it continues to look for a better deal for you. Every day. Four times a day. If it finds the same type of car, on the same dates and at the same location - for a cheaper price - it will rebook you at the lower rate.

What's hot: AutoSlash is saving customers 30 percent, on average, on car rentals. If you plan a month ahead, it's common to get the fare reduced as many as four times. Even better, you don't have to compromise on brands. Dollar, Budget, Hertz, Thrifty and more are all on AutoSlash.

What's not: It does the work of finding the deals, but you might have to lift one finger. If the new rate is with another company, AutoSlash will e-mail you to ask whether you'd like to switch companies - and you will have to reply. If the reduction is with the same company, it will do it for you.

- Jen Leo,

Los Angeles Times