This is a free event with the only requirement being that you post about this event and include the button code in your post! This gets you TWO free links (facebook, twitter or pinterest only). A third link can be purchased for $2. If you chose to NOT post about the event link cost is $3 or 2 links for $5.
If you're not interested in participating as a blogger, be sure to come back here Oct 15th to enter!