Build your own offer. Go into micro niches nobody has even thought of or would enter, and give away something for free. Like for example a free gardening kit.
1. Build a niche image based landing page with a 'Click Here' button.
2. Create a post back page with a process gif image and also pop the cpa offer, give instructions on how to complete the offer.
3. Once your server has been notified that the offer has successfully been completed, redirect to a 3rd page with an opt-in field (name and email). Let them know it's just a sweepstake.
Have it buried into the small print that a winner is selected on every 10,000 entries.
Now you have a suckers list, now cross promote more offers to them and let them increase the 'odds' of winning.