Free: Contests & Raffles.
My understanding is that Pheasants forever will give you the seed, maybe even plant it IF you open it to the public. Since that is not gona happen on his farm that is what he plants.
I can tell you one thing that has been paying dividends is shooting mag pies. You normally find them in all the public ground. When you are driving around looking for hunting spots and see those funny 4x8 boxes on legs out in the middle of hay field, find the owner and help them kill abunch. Those boxes are for cutter bees used in the pollination of the crops and those magpies just LOVE to eat cutter bees and thier Larva.