I just rebooked at Alamo for our trip in June and saved a few dollars over our previous reservation using Costco codes. There is a new wrinkle in the process now. The reservation form now asks for your Costco membership number before confirming the reservation. This is the first time I have been asked for any form of proof of membership when using Costco codes. Fortunately we are Costco members so no hassle for us. I suspect that they may now be asking to see your membership card at the counter too, but have not had this confirmed by anyone yet. BTW, the code did save us over $30 with the same rental without the code.
