StealThis: Got The Best Deal Page
Car abandonment drives ecommerce teams crazy. People get to the last stage of your checkout see the "coupon code" window and leave to look for coupons. This idea is so powerful RetailMeNot.com made a business out of giving YOUR traffic coupons at checkout.
Poster Print Factory put up a simple page that said, "If you are a new customer we automatically apply your new customer discount. No need to look for coupons, you have the best deal." That is BRILLIANT since it brings customers RIGHT BACK to you with confidence.
Be careful about your page title, but you should win yoursite.com coupons as a search AS LONG AS YOU HAVE A PAGE like this one. Brilliant simple marketing. And change your page title to include coupons and promo codes and guaranteed you will win the search since Post Print has a generic title and they win.
If you have a "promo code" box its an IMPLIED promise. When you explain the promise in a relevant way, in my case for new customers, you win and cart abandonment goes down.
When I was a Director of Ecommerce every .5% reduction in cart abandonment was $1M bucks, so this is one of those areas where TINY differences can mean big money. If you have a promo code option in your checkout make sure to have a page that explains your coupons your way instead of handing your traffic over to RetailMeNot.com.