The best and most affordable way to become a real business partner for your customer is by involving him in your development process. You can do this by showing him different concepts and ideas.
Developing new ideas can be quite expensive. By involving your customer in the development process not only will you reduce unneeded costs but you will also become an important partner to your customer. The customer feels appreciated and your ideas will become their ideas, which will make them put in in more time and effort to guarantee a successful launch. In Short, a win-win situation.