I've seen a few clever BYCers make these gravity fed oyster shell dispensers out of PVC. I'd love to purchase one, or see detailed plans. What does something like this run?
Here are links for 2 pages from the Learning Center. For oyster shell I would use 2" pipe. I would guess about $5. You don't need glue. https://www.backyardchickens.com/web/viewblog.php?id=25889-simple-pvc-hopper-type-feeder https://www.backyardchickens.com/web/viewblog.php?id=44920-the-pineapple-diner There is another one that you use a piece of pipe and a Y on the bottom. Search it and you will find many more.