These are my favorite and come in all sizes for whatever size flock. All of them are under $6-10 at feed stores http://www.smartpakequine.com/rubber-feeder-pan-2026p?cm_mmc=Google-_-googlepla-_-TES-_-2109666945&source=pla&gclid=CJDX8Jvy0roCFaUWMgod1ksA8A
I find that having a couple of both are best. I like the 2 gallon galvanized one by Little Giant as they are sturdy and not too heavy. The plastic red and white ones from LG are okay and good for putting vinegar in the water. They can get knocked over when less than 1/2 full. Personally, I...