Thanks for the coupon codes in this thread, save me a few bucks.. here is my contribution...

I saw many people asking what coupon is for what company etc, you can use this link to find that out:

https://www.avis.com/car-rental/profile/go.ac?A126900

just change the AWD number in the end to whatever you want to check. As you can see the above is for Lockheed Martin.

Also note that page is nice to check if there are any coupon codes associated with an AWD as they sometimes list them on that page.

Enjoy