Amazon offers the Pyrex Glass Round 14-Piece Storage Box Set, model no. 6022369, for $15 with free shipping.(Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $11.74.) That's the lowest total price we could find by $10, although we saw a similar set (with rebate hassles) for $5 less on Black Friday. It includes one 7-cup, four 2-cup, and two 4-cup round bowls with seven blue plastic matching lids.
Update: Amazon is out of stock; however, Walmart now has it for $15 with in-store pickup.