Offer a Discount

It's seriously effective for capturing people that may not be in the position to purchase at that moment but still have an interest in your product range. One way to really get the most out of this tactic is to run exit popups that are only displayed when a user is about to click away from your webpage.

Source: http://www.aransweatersdirect.com/

There are a number of different services that offer this functionality and one of my favourites is Optin Monster, which integrates with any CMS and is pretty cost effective.

One of the things you need to bear in mind with offering a discount as a call to action is that your email workflow needs to be designed in a way that will quickly nurture the lead to the point of purchase. If someone is asking for a discount code, it's likey that they're close to being in a position to convert.

If possible, I'd recommend displaying the discount code on the webpage as soon as they've submitted their details. If that's not possible, ensure that you're sending the discount code to them immediately after they've submitted their details.