newegg offers the Dolica Travel Backpack for Digital SLR Cameras and 16" Notebooks
, model no. DK-30, for $49.99
with free shipping
. That's the lowest total price we could find by $11. It features front and side access, dual purpose single-or-double shoulder strap, upper compartment (for additional storage), and front tripod holder. This bag can accommodate a laptop up to 16", one DSLR camera, and four lenses.