With orders of $25 or more, Amazon offers Prime members the Rubbermaid Easy Find Lid 18-Piece Food-Storage Container Set with Lids
, model no. FG7K3900CHILI, for $7.99
with free shipping
. (Non-members can spend over $49 for free shipping; otherwise, shipping costs $7.18.) That's tied with our April mention and the lowest total price we could find by $5. It features lids that snap together and to the base bottoms.