Amazon currently has the Rubbermaid Easy Find Lid 24-Piece Food Storage Container Set  for $10.47.
Or check out the Rubbermaid Lock-its 12-Piece Food Storage Container Set marked down to $10.50 (68% savings). Both ship for FREE with Super Saver Shipping!!
About six months ago I bought the Rubbermaid 7J93 Produce Saver Square 8-Piece Set Food Storage Containers  to help keep my produce fresh during the summer. They have worked REALLY well and are back on sale for $10.47.
Also, remember if you have a student in the house, they will probably qualify for free student shipping !