Walmart offers the Iris Airtight 45-lb. Pet Food Container in Smoke, model no. NMP-L, for $13.22. (Amazon offers it to Prime members for the same price, with a two to five week shipping delay.) Opt for in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $21. This BPA-free container locks shut and features four rolling casters.