Amazon offers Prime members the Corelle Coordinates 6-Piece Microwave Cookware Set in Country Cottage, model no. 20211, for $10.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.85.) That's the lowest total price we could find by $10. It includes 16-oz., 28-oz., and 40-oz. microwave- and freezer-safe containers with vented lids.
Note that it's expected to ship in one to two months.