Ask HN: How to sell mobile source code

About a year ago I wrote and released a fun personal project: a real estate app for iPhone. Besides the technical and UX excellence it is consistently getting low rating and retention numbers. The reason for this is that I can not legally get my hands on enough data to make it useful and engaging. Knowing that I can't attract enough users made me scrape all plans for great enhancements and cool features. While the server and the app practically run themselves and require no maintenance, I don't have any incentive or desire to keep it either. I imagine some of the agencies in the industry may be interested in releasing their own apps and they can probably benefit from my code. What is the best place to search for potential buyers? Industry groups, app marketplaces, social media, etc?