i would send my address with payment, so that the person i bought from would have my address not the other one. and if i am selling i would use my address not the one on paypal, so there would be no issue there? and if for some reason there was, her address is still find we still have the place and check it daily, so it would be no issue if that address had to be used. I would just rather when i send payment, that i send my address to their pm box and they use that one instead of the paypal one, but if need be then i would use the other address.
as for tracking, its quite expensive to get items tracked to the us sometime, for aparcel containing 3 360 games it cost roughly 16 dollars to send with tracking. 1 game cost about the same, as it has to be sent expediated, it can't just be added. if i send to someone in canada its not bad, but to the us it does get expensive.