philbish - 1:11 am on Apr 20, 2012 (gmt 0)
Call UPS, setup an account, and setup daily pickup. Costs like $8 / week or something.
Then use UPS Worldship software, instead of the website. You download this and install on your PC. Or if you have a Mac, use VM Ware to install Windows or something. They can rent you a thermal label printer, or you can buy one for a few hundred dollars.
International invoices can be "built in" electronically to the label, so when they scan the tracking number, they pull up the invoice data as well. It may take some convincing of your local driver about this, but its true. Electronic invoices are available for 80% + something countries.
It is true, that if you're doing paper invoices, there should be 3 copies of the invoice in the little international pocket.
For international shipping costs, just add 10 - 20% on top of the price UPS quotes you, and pass that on to your customers.