Thanks for shopping with us! Payment is due within three days of purchase. We do not bump up our shipping prices! You will always pay actual shipping and packaging prices. We want to provide the most economical shipping costs to you, so for packages weighing less than 13 ounces, USPS first class mail is used. Anything over 13 ounces is shipped UPS ground. UPS second day air is also available for all items. We are happy to combine shipping and many items have one flat rate shipping cost, no matter how many you buy!