Seo is one of the best free traffic. Problem is that it takes some time before starts working. What you could do is make a landing page or even better squeeze page and bookmark it (at least to 5 bookmarking services). Then open squidoo lens and write about product/niche that you are promoting. Make sure that you are using same keywords (and relevant keywords) on LP and squidoo lens and then link squidoo lens to your LP (use keywords in anchor text). After that you should bookmark you squidoo lens. Now you should do the same with all mayor free blog/page services like hubpages, gather, tumblr, weebly, article directorys. Just make sure you always use the same keywords and remember to bookmark them every time you have new post.