1 - The mailchimp module seems to have an "exit" pop up option. I put it for your reference;
2 - What we put together @ DeskPal is not a commercial module - it is a custom implementation. If you are interested in having us implementing it for you, get in touch with me in private and we can see how we can put that together for your site. - Reach me at aderson [at] deskpal [dot] me and we can discuss.