Today Only: Sale on K-12 School Essentials! Still shopping for back to school K-12 supplies? Here are top picks for K-12 school essentials, including must-have school supplies, backpacks and lunchboxes, clothes, books, and much more–all you need for kindergarten, elementary school, middle school, and high school. Have a look around and find everything you need to send the kids back to school. And they are all up to 50% off!