Yup
Try Image Partner from
ColorWorld Imaging. It costs around £20 as a one off fee and then you can upload as many images as you want. You can set up events, password protect them, set your own pricing structure and check every and any order.
When a customer orders anything, you approve it and then it goes directly into their print system. The items can then be shipped direct to them, or to you and you can send them on.
I use them myself. To see my page (that'll show you what the customer gets) click on the "Buy my prints" link in my signature.
All in all, I've been very impressed with the print quality and the service.