In Alaska, there's three farms where one can get qiviut:
Windy Valley Farm, in Palmer;
the Robert G. White Large Animal Research Station of the Institute of Arctic Biology, near Fairbanks;
and, of course, the Musk Ox Farm, in Palmer.
Most other qiviut is obtained from wild animals' leavings on shrubbery, or from the pelts of animals killed in subsistence hunts (that's mostly in Canada). I'm not sure about farms in Canada; the research on them in Saskatchewan has dwindled some.