Yampa Valley Yaks 
Tibetan yaks raised in Steamboat Springs, Colorado, for packing, trekking and breeding.
http://www.yampayaks.com/L K Cattle Company, Inc.
A family owned and operated bonded livestock dealer, buying and selling all classes of cattle. Video and digital marketing services. Located in Gonzales, Texas, USA.
http://www.lkcattle.com/
Tregellys Fiber Farm - Yaks
Tregellys farm is also home to 8 yaks bred in New York and New Hampshire, but of Tibetan heritage. Located in Hawley, MA, USA.
http://www.tregellysfibers.com/animals.html
Hoopers' Yak Ranch
Offering bred cows and heifer calves for sale. Also features information about Yak and Yak ranching.
http://www.yak-man.com/
Yaks
Information on the yak as a domestic and wild animal, with photos, breeder listings and related links.
http://www.domestic-yaks-wild-yaks.com/
Delyaks
Breeder of Tibetan yaks; golden, royal, imperial and black varieties available. Includes animal information, photographs, meat pricing and order form. Located in Montrose, Colorado.
http://www.yakmeat.us/
