REI offers the Timbuk2 Slate Backpack in Truffle for $43.93 with free shipping. (Amazon has it in Truffle
or Carbon Twill for the same price.) That's the lowest total price we could find by $7. It features a padded pocket that fits up to 15" laptops, mesh back panel, mesh side pockets, front webbing straps, and adjustable shoulder straps.