Skullcandy via eBay offers the Skullcandy Firm Backpack in Camo or
Cyan(pictured) for $21.50 with free shipping. That's the lowest total price we could find by $13. It features a front pocket with organizer, fleece-lined media compartment, adjustable straps, and more.
Skullcandy Skulldaylong Audio Backpack Black/Blue, a similar product, is available at these stores