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".
Walmart offers the Danskin Now Women's Active Long-Sleeve Mesh-Detail Performance T-Shirt in five colors (Cabo Blue pictured) for $5. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $5 off list and tied with our mention from a week ago as the lowest price we could find. It's available in sizes XS to XXL, although not in all color/size options.