$4.99 Upgrade Links Not Working

I have a couple of your printed books on Perl that I registered today because I wanted to get the eBooks for the $4.99 special to put them on my Android tablet. The "$4.99 Ebook Upgrade" links appear in my account for each book under a category called "Upgrade Discounts", but when I click them, they add the ebook to the cart at full price on both books.

The books involved are:
* CGI Programming with Perl, 2nd Edition
* Programming Perl, 4th Edition

Please let me know what I need to do to get the $4.99 price. Thanks for your help.
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