Target offers the Pyrex Easy Grab 6-Piece Value Pack in Blue for $12.23. Opt for Site-to-Store pickup to avoid the $4 shipping charge. That's the lowest price we could find by $8, outside of the mention below. It includes a three-quart container with lid, six-cup container with lid, and three-cup container with lid.
Of note, Walmart has it in red for a buck more.