Meat Hunter, go to your neighbourhood grocery store meat counter (Not a big box store like sams or wally world, but like Krogers or Price Cutter or Safeway) and strike up a conversation with the meat cutters.
They will be happy to either "give" you a couple pounds of tallow for essentially pennies, or you can ask them to leave it on the chucks and roast you will from now on ask them to cut for you
It's more expensive that way, but you know where it cam from and the cut of meat.
The meat folks are like the rest of us- they like to cook, for the most part know their meats and are willing to help someone who knows what they are talking about.
Good luck to you!