Looked around - seems like a common issue...I've tried to use the $4.99 ebook upgrade and it doesn't work correctly.
This upgrade is for "Code Complete 2ed"[http://shop.oreilly.com/product/97807...] - the (paper) book is listed in my account. I thought I should get the ebook before Microsoft Press leaves oreilly.com.
I can click on the "$4.99 Ebook Upgrade" link, but when my cart is shown, the ebook is listed as $15.99 (marked down from $39.99).
Update: Just checked, and the $4.99 eBook upgrade doesn't show up correctly for my copy of "Unix Power Tools, 3ed" either (figured I might as well get too that while I'm here!)
I apologize that the $4.99 ebook upgrade button is not appearing when these titles are registered. I will e-mail you directly and provide you with a code you can use to get these ebooks for $4.99. Sorry for any inconvenience this may have caused.
Customer Service Representative