Labels printed through Paypal, they should send you an email with tracking. If you want books shipped a different way drop me a PM.
Media Mail - 3.40 no limit on books but keep in mind there is always the risk of inspections & delays
Flat Rate Envelope - 5.30 10-12 books comfortably, a thin slab of wood backing is used
Regional Priority (box A) - 8.00 holds 35-40 books, customers in zones 1-4 (the northeast) will get a partial refund.
Medium Flat Rate Box - 10.50 holds 50-60 books
Canada - 23.95 (4 lb max) I can do priority or first class, whichever is cheaper, so you may get a partial refund.