Staples offers the Jansport Vector Accessory Pouch in Black for $6.39. Opt for in-store pickup to avoid the $9.95 shipping charge. That's the lowest price we could find by $10. It measures 3" x 7.5" x 2.5".
Brooks Brothers takes up to 70% offclearance apparel, shoes, and accessories. (Prices are as marked.) Shipping starts at $5.95, although orders of $250 or more qualify for free shipping. Sizes and stock may be limited in some styles. A couple of best bets, both with $10.95 for shipping: