This site is accessible only by Comcast Xfinity Insider Loyalty Program members and their families and is protected by a combination of integration with the Comcast SSO, and a data transfer process created to define members by unique GUID and keep the data synced between the site and the data held by Comcast proper. The offers displayed here are pretty sweet, and your odds are good if you fit the membership criteria.
The frontend was re-designed this year (2015), and is the second re-design completed under my purview. It's responsive on 3 breaks, but the real engineering is evidenced by the backend, which is capable of dynamic targeting of many types, simultaneously down to an individual GUID in a given zip code.