Amazon offers Prime members the Snapware 18-Piece Airtight Food Storage Set, model no. 1098452, for $17.82 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $8.24.) That's at least $5 less than you'd pay at a local retail store, outside the offer below. Each containers features an airtight gasket seal.

A close price: Walmart offers it for $17.88 via in-store pickup.