These are some farms I have done business with and had good experiences with. There are many other great breeders out there, these are just the ones I have personally purchased goats from.
Gabhran Creek Nigerians Billings, MT (photo by Gabhran Creek) Home (webs.com)
Treasured Sunrise Acres I got an amazing foldable metal milk stand from these guys. Highly recommend looking into them. Bramble berry I get a lot of my soap supplies from here. Simple Pulse I got my milk machine from Simple pulse. Its a very nice system, and is super easy to use. The Goat Shop This is where I got my plastic chain collars for my milkers. They come in so many colors and work very well on the Nigerians. Caprine Supply I get all kinds of odds and ends here.