Summer just got started but Target is already thinking about back to school!The retail chain is bringing back their extra discount for teachers.Starting July 13, Target is giving educators 15-percent off on school supplies, clothes and other back-to-school essentials.That includes everything from the basic classroom needs to cleaning supplies and even playground equipment.Teachers do need to get the coupon emailed to them and have a school ID when checking out.To sign up for an educators discount go to Target.com/teacherprep.The offer is valid until July 20.