I thought I would compile a list of livestock supply websites in one spot. It will certainly help me to have them in one spot and I hope it will help you too. Please e-mail me if you would like new ones added to the list or if a link is old or broken.
Jeffers sells pet and livestock supplies including books, signs, egg cartons, health supplements, feeders etc. They have reasonable prices, with free shipping on orders over $60. I have ordered from here before and had a good experience.
QC Supply sells lots of livestock equipment. I have not personally ordered from them before.
TSC sells feeds, livestock equipment, coops, heat lamps etc. Some people have a local store. Here is there site.
Twin City Supply Poultry and Game Bird Supplier is one of my favorites! They sell LOTS of poultry equipment, from books and feeders to incubators and vaccines. They are very affordable! I buy my Mareks vaccine here.
And here is a site with a list of more sites;