Walmart offers the Sterilite 18-Gallon TUFF1 Storage Box 6-Pack in Green Chili, model no. 16752A06, for $46.44. Opt for free Site-to-Store pickup to avoid the $4.97 shipping charge. (Alternatively, pad your order over $50 to get free shipping.) That's the lowest price we could find by $9. They're stackable and feature snap-lock lids.