I mention Google Adsense in my recommended Google Tools, because it’s an easy way to make money on site exits. For example, out of every one hundred visitors to your site on average 99% will leave without taking your desired action. So having Adsense gives you the opportunity to make money when people exit your site.
You can position your Adsense block within your products or main site template and give it a title such as: ‘Customers Also Liked’ or ‘You May Also Be Interested In’, which helps it integrate into your site. Alternatively, you could position it as ‘Site Sponsors’ or just have it showing as Google ads. Adsense is also ideal for putting on the Order Confirmation page or even Contact or Newsletter Opt-in Confirmation pages.