B&H Photo Video offers the Incase Staple 15" Laptop Backpack in Clay/Black for $29.95 with free shipping. That's the lowest price we could find in any color by $30. It features adjustable padded shoulder straps, back panel security pocket, and storage for up to a 15" laptop.

Also available is the Incase Designs Corp Cargo 15" Laptop Backpack in Heather/Black for $34.89 with free shipping. That's the lowest price we could find by $25. Similar to the bag above, this model also features internal organizer pockets and a media pocket with built-in cable port.