MagDNA and Zometool products will be shipped from different locations. If only ordering MagDNA products, the most inexpensive option is USPS Priority Mail or USPS Parcel Post. If only ordering Zometool products, please choose a UPS option. When multiple products are ordered, shipping rates per product will be less due to combined shipping. For example, USPS Priority Mail shipping in the USA of one MagDNA item is $5.00, but shipping of ten items is only $14.00. SKYBAY Education will try to keep shipping and handling costs to a minimum. If the shipping calculator at this website over-calculates shipping and handling costs, you will be refunded the difference. Thanks!