B&H Photo-Video offers the Manfrotto Bella II Shoulder Camera Bag in Bungee Cord, model no. MB SSB-2BC, for $9.95 plus $2.99 for shipping. That's $20 under list and the lowest total price we could find, outside of the mention below. It features a nylon exterior, padded interior, front zippered pocket, buckle and zippered closure, and adjustable shoulder strap.
A close price: Roberts LP via Amazon offers it in Black for $12.99 with free shipping for Prime members.