I'm currently running a Kindle Countdown on the Kindle version of Love Lessons from a Lap Dancer where it should be priced at 99 cents US from January 1 to January 6 on Amazon.com.
When I went to the Amazon.com page for this book today, however, I still see it priced at $7.69 US not 99 cents US as I specified when I set up the countdown.
I'm wondering if this is because the deal is only for those in the US market (Canadian customers need to buy Kindle e-books from Amazon.ca) and I am looking at it from a computer in Canada (I'm in Toronto) so it wouldn't show.
I'm in Edmonton and I just went through the same thing you are asking. The problem was that I was looking at the Amazon.com site while I was still logged into my american account. As soon as logged out I was able to see the Kindle Countdown price.