Most likely, school supply lists will have come out by now. Usually, they come with school schedules or report cards. However, if any school fees have not yet been payed, these papers will be held at the school until all student fines are paid. However, places such as Walmart or Target probably won't receive lists (and have them available for students to take in stores) until August gets closer. Good luck!
In addition to contacting your child's school directly, you may also peruse the general supply suggestions that Education.com's editorial team has compiled. They are listed for the various grades on the Back to School page linked below. Thanks for asking!