Tax Exempt for an Elementary School

I am a Principal Secretary. My name is Sonia and I work for Granite School District at an Elementary School by the name of Robert Frost Elementary in West Valley City, UT. I need to order a couple of IPads for our school use. I have a credit card to use, however, I cannot use it if there are taxes added to the purchase. Is there any way I can get a tax exempt purchase for both orders? I do have to purchase both IPads separately as well. Please get back to me as soon as you can as our budgeting money is coming to an end for this school year shortly. If someone could call me and I can make the purchase over the phone or please advise how and where to go from here. Thanks!