Purchase Price and Payment. Prices, specifications and availability of goods and services are subject to change without notice. Customer will pay the price established by us for all goods ordered by Customer or using Customer’s account. Full payment shall be made before delivery of the goods, unless otherwise agreed in writing by us. Any amount that we agree may be paid after delivery is due to us within thirty (30) days, or such lesser period as may be determined by us as set forth in an applicable invoice. In addition to the purchase price and any shipping costs, Customer will pay all applicable taxes, including but not limited to sales, use, value added, gross receipts, privilege, excise and personal property taxes, levied on or measured by the purchase price or arising from the use of the goods and any parts or maintenance supplied or the services rendered. Prices do not, unless otherwise specified, include supplies. You agree to pay interest on all past-due sums at the lesser of 1.5% per month or the highest rate allowed by law.