Book Funnel - Is There an Additional Cost to Entering My Book in a Promo?

Many of you listening already have a book funnel account. So if I want to enter my book into a promo, is there an additional cost to that other than what I'm already paying for a book funnel? All you have to do is keep an eye on the group promos and enter as appropriate. This can be a really good way to add really good email subscribers to your list. And otherwise, you don't need to come back and like browse the board every single day looking to see if there's anything new.