The period goes from November 30 to December 5 (5 days, 3 hours). When I did the search, it shows all the results in a tabled format. I clicked on it, went through the whole process and even used a Walmart coupon code I searched for on google, which claims 20% off as well through Orbitz.com.

Edit: The original rate is not there anymore. Rates have shot up tremendously since I made my res.