There are many venues to choose from. Amazon, Reddit, ESPN, Twitter, Craigslist, Instagram, Pinterest, Yahoo, and Bing are just a few mass-market websites with targeting functions and plenty of eyeballs. Post or advertise your product, send the customer an offer, and see what happens. If you have cash to throw at hard proof, my favorite mediums are Amazon, Google AdWords and Facebook ads, all of which offer enhanced audience targeting. No cash? Try Reddit, Craigslist, or targeted Facebook groups.
