Shipping is at my cost.
OUTSIDE THE U.S. you can order as many as 20 without the plastic cases and only pay $25 for shipping. I can also send individual items without the plastic cases. Discounts available for more items, too. Unfortunately the US Post Office recently raised their prices over double for single items.
CANADA buyers: I will refund $4 for shipping after purchase to compensate for the lower shipping cost for single items. $20 will cover shipping for up to 20 without plastic cases. Other packages available.
INSIDE THE U.S. I will work with you with any variation you need. $13 will ship as many as 40 with cases. $17 will ship as many as 60 with cases. Media Mail is available. Those quotes are for shipping only.