I am getting awesome results with
CrakRev's Survey Generator 2.0.
Incredible conversion rate so far on low amounts of traffic.
Probably the best offer I have ever seen in my time doing affiliate marketing so far. You can easily add your own logo/background to make the survey seem legitimately affiliated with your site, rather than have it look like some spammy popunder.
Very easy to promote because people love rewards. I thought Surveys were a joke back in 2014 when I first started with them, but this thing kicks ass.
Edit- And I haven't even started promoting it fully yet. This is just stats from my hobby project.
https://i.imgur.com/XiSX0yE.png