I would like to suggest that either a system is created to assist us with connecting to print on demand software for products that we would like to offer in our shop to allow us to offer more variety.
Satisfied End Users Testimonies
Have you thought about collecting comments from the end users of the online stores (customers of your customers). It would be a good way for those of us starting out to show satisfied customers. I like the example stores but testimonials from the schools or other organizations would really be great.