Here are some Alamo codes below that have been valid in past years. I tried all of them based on 11 day trip for mid-May and they worked. They may or may not work for you based on the terms of your rental. It's also possible they may provide no real savings. The car rental game is a crap-shoot. Use at your own discretion. Happy car hunting!
Contract ID
7014627 COSTCO WEB OFFERS
675899 COSTCO - WAIVE ADDITIONAL DRIVER
7014696 BJ’S WHOLESALE CLUB
7016136 AMERICAN EXPRESS
7014295 AMEX MY VACATION 08 EMAILS
7014291 AMEX
7016350 VISA
7015504 VISA
7000799 VISA SUMMER AND FALL OFFERS 2005
7013843 VISA FALL 07 ONLINE OFFER
7012032 MASTERCARD CONSUMER 2006
7014926 SAVE WITH ALAMO
7016220 VISIT ORLANDO
7015071 WYNDHAM REWARDS
860292 DISNEY PASSHOLDER
7016141 SOUTHWEST
7016594 SUN COUNTRY AIRLINES
306705 UNITED AIRLINES WEB OFFER 2004
7014667 QS SUNPROMO
7015360 EDVANTAGE
7014644 NEXT JUMP 08 WINTER PROMO
189183 AMERICAN VETERINARY MEDICAL ASSOCIATION
253173 AIR FORCE ASSOCIATION
372109 MTA BENEFITS
706768 ASSOCIATION DISCOUNT - SMALL GROUPS
Coupon Code
AU2291VYT 1 car upgrade
AU3Z64SDG BJ's1 free Upgrade