The more you buy, the lower the shipping per item rate you get. We do combine shipping for all your purchased items. Ship the same day if payment received before noon or the next business day if received after 12:00PM by UPS, USPS. Different ways of shipping is possible. Resale number is acceptable for California customer to avoid tax. Email us at service@durapak.net should you have any question. Pay me securely with any major credit card through PayPal. I accept PayPal payment, money order/cashiers check, or e-check. E-check may take 3 to 4 business days to clear. For e-check payment, we will only ship out after e-check clear.