Some good options include exit popups, lightbox overlays and squeeze pages.

According to Conversion Sciences, correct implementation of exit popups can reduce the amount of visitors who leave your site without taking action by anywhere from 10-15%. These popups are triggered when a visitor moves their mouse near the “back” button or toward the “X” to close out a window – or when they haven’t moved their mouse for a certain amount of time.

Lightbox overlays are similar to exit popups in that they appear on top of the content of the actual page a visitor is on – but they aren’t necessarily triggered during exit-intent actions. A good way to think about it is: exit popups are a type of lightbox overlay.

Finally, squeeze pages may include offers for further information or freebies, such as ebooks, customer testimonials, and how-to videos – but would require the visitor to enter their email address or other contact information before providing access to such content. In turn, not only will the visitor receive the content they requested, but they’ve also opened the door for the company to send further information in the future.

You can find more info on all of these — and how to grow your local business using them — in Fieldboom's blog: http://www.fieldboom.com/blog/growth-hacking-exit-popups-lightbox-overlays-squeeze-pages-leads/.