Wilson's farm supply mills their own feed so I would check them out. Most animal feed bags are not air tight so it loseses some nutritional value over time due to oxidation so I try to buy from a place that has fresh feed and I use pellets for all my adult birds because its less prone to...
I buy from the co-op most times but sometimes I go to Caldwell feed my chickens won't eat dumor unless they are really hungry l worked at Caldwell feeds so I know its quality. Tindle brand is also available but my chickens turn their nose up at it as well.
good luck with them im getting seramas next but I might get some sebrights too they are so beautiful sorry about you have to sell your ducks mine just started laying and I have a beautiful pair of lavender Muscovy ducks too.