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 offers the Bogs Men's Cruz Chelsea Rain Boots in Mocha or Black Olive for $66.83 with free shipping. That's $68 off list and the lowest total price we could find. They're available in select sizes from 8 to 14, although not in all size/color combinations.