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".
Gap Factory offers its Gap Women's Short-Sleeve Tee Dress in Heather Grey, Blue Stripe, or Red for $18.99 plus $7 for shipping. That's $14 off list and the lowest total price we could find. It's available in sizes XS to XXL, although not in all size/color combinations.