Websites about Mesothelioma

My former business partner and I created several websites about Mesothelioma, Asbestos, and Asbestos Cancer as an experiment in internet marketing. We were able to get some pretty good rankings in a very short amount of time and unique content on each site.

However, we are no longer working together and would like to sell the sites to someone who would like to pursue building them and growing them. But what is the best way to sell the sites? I have looked into Flippa.com - but are there other ways that are better?