I’ve actually taken online upselling a step further, by designing a system which can be implemented into almost any shopping cart or payment system that produces an optimized offer AFTER the customer “checks out”.

I’ve done tons of testing and have developed an almost perfect upsell system. The customer only needs to click an “Add to my order” button and doesn’t even need to fill out the order form again, which is one example of what I’ve learned through my testing that increases conversions. You can read more about it at http://www.onlineupsell.com.

All The Best!