All orders are either net 30 (with approved credit) or payment by paypal request. We will add shipping costs (regular UPS, no added handling charges) to all invoices and inform you of freight charges prior to payment. If you want net 30, we will ask for a credit sheet. We do not need credit sheets for institutions (museums, for example). But we do need the cell phone number of a contact person. We do not keep credit card numbers on file.