Neb. Rev. Stat. § 77-2704.25

Sales and use taxes shall not be imposed on the gross receipts from the sale, lease, or rental of and the storage, use, or other consumption in this state of property sold by parent-booster clubs, parent-teacher associations, parent-teacher-student associations, or school-operated stores approved by an elementary or secondary school, public or private, if the proceeds from such sale are used to support school activities or the school itself.