Oneida offers the Anchor Hocking 16-Piece Glass Food Storage Set for $19.99. Coupon code "DEALFREE" drops it to $15.99 and bags free shipping. That's the lowest price we could find by $4 and the best deal we've seen on this set. This set includes one 1-cup and two 2-cup round containers, one 6-cup and 4-cup container, and two 6-oz. containers. Deal ends June 25.
Update: Specs corrected.