I don't know about iphone, but for my adroid phone, I have an app called wcharge that I can use to process cards on the go. I am hoping they come up with something like square has in terms of the card swiper though as it is cumbersome to process cards on a phone. Like you, I'd rather not use paypal and square, especially since I don't do card present transactions often (right now just at shows 2-3 times a year).
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You can go to USPS.com and click on Click and Ship. It is an easy way to ship International Priority Mail. Mostly customs forms are filled out for you.
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