RE: white bison longbows
Those were made by Steve Hohensee. Unless he sold the name (and I don't think he did), you will have hard time getting a new one--Steve only makes a bow on ocassion for himself and friends now. Steve used to live in MO, but has been in AK for the last few years and will probably be there for a while yet.
I never shot one of his bows, so I couldn't give an opinion, but Steve has sure killed a whole lot of animals with his.
Chad