Domestic Buyers:

Buy as many Manuals in the Shop Manuals and/or in the Magazine categories with ++++ in the title and pay shipping on only the first one.
Either wait for an invoice, or if you pay up front, I'll refund the excess shipping.

International Buyers: Inquire about savings on multiple purchases in these categories. I need to figure the weight. Once the package exceeds 4 pounds,
it must ship buy Priority Flat Rate box which is very expensive.