Oneida offers the Anchor Hocking 6-Piece Glass Kitchen Storage Set, model no. 91554L11, for $5.99. Coupon code "FEB15" cuts that to $5.09 and bags free shipping. Outside of the seller below, that's the lowest total price we could find by $3, although we saw it with a $5 store credit for $7 in November. It features three 2-cup bowls with lids.
A close price: Big Lots retail stores charge $6. (Stock varies by ZIP code.)