Hi. I was wondering if anyone knew of a place I could buy oyster shell in larger quantities? The local feed store only sells it in 5lb bags and that's all I can find online too. I was hoping for a larger bag (maybe 25lbs?) instead of having to order 5-6 small bags a month. I normally mix some with their food but they kept knocking the container over. So I started giving it to them in a separate feeder after I read another thread about it here and they actually eat quite a bit of it. Any help would be appreciated!