I am also looking for one but I want a vertical one. A friend said that he saw one at a home show but can not remember the name. I have searched the web and I have found nothing yet. Let me know if you find one. I also thought about building one from bicycle type chain that has a post on each link. I remember seeing it being used on something.
Contact Grainger for a catalog. They have bin systems that might work for you. These are like the ones used for nails in hardware stores.