Buy.com offers the LEGO Vertical Lunch Bag
in four colors (Black pictured), model no. LN0125-100S, for $14.99
. With free shipping
, that's the lowest total price we could find by $1, outside of the mention below. Features include an insulated main compartment, front slip pocket, reflective design, and more.
A close price: Zappos has this bag (in three colors) for $15 with free shipping.