Hello,
A friends sent me some car rental promotion codes valid this holiday season. They can be used at www.discountcar.com

You need to enter them in the Special Promotion section of the home page.
First code
VIP08
the code above gives 10% off regular rates

second code
HOLI8
gives you 2 days off when you rent a car for 5 days (rent for 5 days and get 7 days)

I hope that helps.
Cici