Wal-Mart has the Rubbermaid Easy Find Lid Container Set priced at only $10.00 right now, and its available for free store pickup! This is a 24-pc set, but it includes 6 bonus pieces, making it a 30-pc set. Containers and lids in this set are microwave, freezer, and dishwasher safe, and the lids snap together and to the bases when not in use for easy storage. The graduated sizes also make storage a lot more organized, since the containers can nest inside each other.
I love picking up extra food storage containers right before school starts to use in school lunches. Getting a great deal on them also makes me feel a little better about some of them getting lost or broken throughout the year.