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".
REI Garage offers the Cannondale Men's Pack Me Jacket in Yellow or Red for $26.73. Opt for in-store pickup to dodge the $5.99 shipping fee. That's $63 off and the lowest price we could find. It's available in sizes M to XXL, although not in all size/color combinations.