Sounds like a technical problem. Once your'e logged in, you should see just about every item's price change across the board. Make sure you refresh the page once you're logged in. You might have to remove anything from the checkout counter for this to work.
I too showed up and shopped around before logging in, and noticed no price change, But when I came back and logged in prior to heading off to the payware section, it seemed to kick the sale prices into gear.
TLDR- Don't worry, the discount is real. No code to apply. Just make sure you're logged in FIRST before you start to shop around.