Thanks to earlier info that I read on the boards, I was able to reserve a car with Alamo using the Wal-Mart code and the Discount Coupon code on Alamo's web site. However, someone also mentioned being able to get an additional discount for prepaying. However, they said that it had to be within a 30 day period before the rental. Does anyone know how to do this with an existing reservation, or can you only do this when you make a reservation within the 30 day window? Didn't see anything on the web site that even mentioned being able to prepay. Any help will greatly be appreciated. Thanks. 
