Prices shown are subject to change. You will be notified of any price changes prior to order acceptance and shipment. About shipping charges – Our website does not calculate shipping charges. Shipping is added to the invoice at the time your credit card is charged. Due to the length of stock quartz tubing, shipping can often be as much as $25-50. IMPORTANT NOTE TO INTERNATIONAL CUSTOMERS – Terms for International Orders International orders are subject to the following terms – 1. Payment terms are wire transfer in advance against our pro forma invoice. 2. There is a $ 35.00 bank charge added to the invoice. 3. There is a $ 25.00 export document fee added to the invoice. 4. Actual shipping charges are added to the invoice. Once an order is packaged for shipment, a pro forma invoice is emailed to the customer along with our bank information. When payment is received at our bank the shipment is released to the carrier and a tracking number is emailed to the customer.