Amazon offers Prime members the IRIS 50-lb. Airtight Pet Food Container in Clear/Black, model no. MP-400, for $20.49 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise it adds $10.30.) That's the lowest total price we could find by $11. It's BPA-free and stores up to 50-lb. of dry pet food.

Update: Walmart offers it for $20.26 with free Site-to-store pickup.