http://www.avis.com/car-rental/html/bridge/assoc/static/usaa/freeupgrade.html
Enjoy a Complimentary Step Up from Avis
Receive a Free One-Car-Group Upgrade when you rent an Intermediate through a Full-Size Four-Door car. Maximum upgrade to a Premium car.
Offer valid on Daily, Weekend, Weekly and Monthly rentals at participating locations in the contiguous U.S..
Use your Avis Worldwide Discount (AWD) # A177232 and coupon # UUGA072.

http://www.avis.com/car-rental/html/bridge/assoc/static/usaa/40percentoff.html
Save up to 40% off Daily, Weekend and Weekly Rentals
Avis is offering up to 40% savings on your next daily, weekend or weekly rental. This offer applies to all car groups from fuel efficient compacts to sporty convertibles.
Use Avis Worldwide Discount (AWD) # A177252 when you make your reservation for travel on or before December 31, 2009.
Offer subject to complete Terms and Conditions.

All with the usual USAA benefits thrown in:
http://www.avis.com/car-rental/html/bridge/assoc/static/usaa/faq.html#ans1

Other USAA coupons:
http://www.avis.com/car-rental/html/bridge/assoc/static/usaa/