A best bet is the Garnet Hill Kids' Rollie Backpack (pictured) in seven colors for $42. Coupon code "J24BV4U1" cuts it to $31.50. With free shipping, that's $10 off and the lowest total price we've seen for this bag. This water-resistant backpack features two zippered compartments, a front zipper pocket, pen and pencil organizer, mesh water-bottle pockets, padded shoulder straps, and more.
Of note, for larger purchases, use coupon code "H2W207B" to cut 40% off clearance and sale items. However, with that coupon, shipping starts at $6.95. (It doesn't stack with the above coupon.) Coupon expires November 17.