Would be interested in an outsiders thoughts on the best creative to express the idea of the site and have banner-ad viewers turn into active users.
My initial thought would be to simply have different banner ads highlighting a product along with its price graph. It quickly shows the utility of the site and how you can save money by knowing the best time to buy. Turning product info such as:
into a mini-banner ad could provide some insight, more so than a simple brand focused ad.