Best Buy offers the Incase 13" Campus Laptop Case in Purple/Gray (pictured), model no. CL60332, for $24.99. Pad your order over $25 to bag free shipping; otherwise it adds $2.99 or pickup is available. Excluding padding, that's the lowest total price we could find by $21. Designed specifically for the Apple 13" MacBook Pro, it features a detachable shoulder strap and fleece-lined compartment. (Note that it is suitable for use with other 13.3" laptops.)

Also available is the Incase 15" Campus Compact Laptop Backpack in Black, model no. CL55463, for $29.99 with free shipping. That's tied with our November mention and the lowest total price we could find by $10. Designed with the Apple 15" MacBook Pro in mind, it features two external zippered pockets, padded shoulder straps, quick-access pocket, and fleece-lined compartment. (It's also compatible with other 15.4" laptops.)