Any coupons for Avis or Hertz upgrade for Albuquerque?

[Rajah]

Anyone know where I could get a class upgrade coupon or discout coupon for Avis or Hertz car rental? I'm AAA, but the AAA discount with Hertz isn't enough to make that worth going with instead of Avis. Both of those are cheaper than going with National's Emerald Aisle, which we usually do.

Any suggestions?