all the Slaughterhouses here....and there are many....have their own Tanneries attached....so nothing goes to waste....all of the Blood and guts come to the refinery I work at.....for Bio-Deisel....bones go to Calcium refineries for Dog Food and Supplements....almost zero waste
I either make mine ....or buy it from All Native People Trading Post.....Tandy Leather or Springfield Leather Co.