Alamo
Under "hot deals", a number of offerings, including discounts for specific cities only. Check the list carefully.

Avis
The promotions here include a 10% on-line discount.

Budget Car Rental
For those who don't like trains, Budget has some European rental deals.

Dollar
Discounts offered in twelve frequently-visited U.S. states.

Hertz
Special fares frequently offered here, but read the fine print at the bottom.

National
"Specials to Go" offers a 10% discount to on-line customers.

National Tilden
Offerings each Wednesday for U.S. and Canadian cities that are only available on-line.   Data Base Searches Auto Europe European discounts up to 15 percent, and a few deals to Florida or California.

Carfinder
From Preview Travel, a database that points out the lowest rentals at major U.S. airports.

Car Hire Direct
Rent a variety of vehicles in North America, Europe, South Africa, Australia and New Zeland. Online booking available.

Travelbest
Here is a database for locating the lowest rates in all 50 states.

Business Travel Car Rental
The latest on the best deals from about.com guide Bruce Goldberg   Rental Bikes and Motorbikes Adventure New Zealand Late-model motorcycles for rent, and the site claims they are cheaper than the "buy back" option so popular in many places.

Expedia
Click on your destination, then select "transportation" and scroll down to "bikes".

Holiday Bikes
A company with 28 locations in France and 900 new motorbikes for rent.

Raleigh Ireland
A list of places in Ireland renting Raleigh bikes. Some include webpage and email links, all list phone numbers and addresses.

Biking, Bed and Breakfast
A comprehensive list of good available biking near top B & Bs, from about.com guide Elizabeth Arneson.