Free: Contests & Raffles.
I don’t waterfowl hunt too often anymore, but majority of the time saw a few boxes of waterfowl loads on the shelves of the places I stopped in over the summer throughout the west. Keep at it, you’ll stumble upon ammo. If it helps, mid morning on weekdays is when I always saw ammo.
Waterfowl loads, impossible to find and can’t hunt with out them, just facts not excuses. Sorry for the confusion