I'm not very knowledgeable about car rental discounts. I have seen a lot of threads here on the Transportation board discussing that topic. Here's a good thread posted today: http://www.disboards.com/showthread.php?t=819815
Scan through the topics on the first few pages of the Transportation board or do a search for thread titles that mention the word "code" or "coupon" or "rental", or "National" or "Alamo". Restrict your search to just the Transportation board.
In my case we were renting for just one day so a lot of the codes other people were using were not applicable because you had to rent for more than one day in order to use them. We ended up booking with the AARP discount which was about the only discount available at the time that could be used for a 1-day rental.
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