Groupon offers the Lock & Lock 16-Piece Storage Container Set (pictured) for $17.99 plus $3.99 for shipping. That's $17 off list price and the lowest total price we could find. It includes eight containers with lids, purportedly combining to be air- and water-tight.
Also available is the Lock & Lock 24-Piece Storage Container Set for $31.99 with free shipping. That's $43 off list and the lowest total price we could find. It includes 12 containers with lids. Both deals end August 1.