Most of the knives I buy come from outside of Australia, and I’ve found paypal to be the simplest and most reliable method of paying people.
The fees are more affordable than international money orders, and there are less potential problems than direct money transfers.
As I understand it, the fee structure depends on where the money moves from/to, and the banking rules in those locations. For example, paypal Australia just sent out an e-mail explaining the new rules they have to abide by to have an Australian financial services license.