I would be surprised if a butcher couldn't sell you hog fat. I haven't bought any in a while but when I used it it was always available. You won't need much if you're using pure fat; for a 15% ratio it would be about 1 lb of fat to 6 lbs of venison. Better plan is hog butt, either 60/40 or 50/50 if fat enough. As BO said, butts are available for $.78-$.99 most of the year if you watch for sales.