Truthfully when I was doing swaps I probably irritated a few meisters because I wouldn't put stamps in the envelope for return. I'd have my package weighed and then I'd double whatever it was, usually no more than $4 bucks and put 4 singles in the evelope, with the note use what you need and if any others are short use it on them. Or whatever!!!!!!!!

Most are having the packages weighed anyways so it's that much easier!!!!!

Just my 2 cents

Fatman