ive had some decent results with freebie email submits on craigslist , Restaurant gift cards did particularly well, But i did have problems with flaggers, but i did manage 150 a day, i was using an autoposter.
Remember to double meta refresh to hide referer, also most of these leads will not follow though, so plan on being asked to stop promoting the offers after a month or two. Back then there was tons of email submits, i dont know about now though