I will get the cheapest shipping possible and even email you with the receipt for shipping so you know I am not cheating you out of any of your money plus if you want extra like tracking or insurance I will put that on for additional cost or just go flat rate box so it is included. :) Hope that helps.
Both shirts should be able to fit in a bubble envelope yes and its not like they are heavy so shipping shouldn't be very expensive at all. And yes I except PayPal :)
No none that I have seen and I have rechecked after this comment just to make sure. Any clothes that have stains or tears I either donate (depending on how bad it is) or repurpose them.