I'm looking to sell some original non-adult software to a very niche market, and I want to give the buyer the option to either pay me a certain amount of money directly through paypal, or finish a totally free offer from an affilated sponsor. I need something that really is 100% free for the user and the user never has to pull out a credit or debit card... and once they complete the sponsor offer I get some kind of confirmation so I can send the user a software file/key. For the totally free offer, I was looking at some dating sites as one option. But I'm concerned that they won't accept incentivized traffic. I've also been thinking about using a pay-per-confirmed email program, but I'm wary of how well it can be tracked on my end to make sure the company will pay me what I'm really due. Any advice on what company to approach will be greatly appreciated.