Icydeals via Amazon offers this 20-Piece Stainless Steel Bowl and Lid Set
for shipping. Outside of the mention below, that's the lowest total price we could find by $3, although we saw this quantity for $5 less in September. Sales tax is added where applicable. It includes 3-, 4-, 5-, 6-, and 7" bowls with lids.
A close price: today only, MidnightBox has such a set for $17.95 plus $3.99 for shipping.