REI takes up to 62% off a selection of apparel, shoes, accessories, gear, and more as part of its Pre-Holiday Sale. (The banner advertises up to 30% off, but we found deeper discounts within.) Even better, all orders receive free shipping. (In-store pickup is also available.) Deal ends November 23. A couple best bets:
Target offers the Lyndale Men's Messenger Bag in Navy for $12.48 with free shipping. That's $13 off and the lowest total price we could find. This cotton bag measures 11" x 15" x 4" and features a flap closure, magnetic closure, and interior zip pocket.