I usually send a few dollars in US money to cover postage, because living outside of the US (in Canada) it is not possible for me to put return postage on the envelope. Something to consider for both the sender and receiver of a B&P.
The last time I did this was at the ABB in Hershey last summer. The guy behind me asked if he could get a copy and proceeded to bribe me with buds. I told him I do not partake in the sacrement, so he gave me a folded up piece of paper with his address.
I pulled out the paper when I got home and there was a $20 in there
So I spun him the discs, bought the postage and put the change back in there with the discs when I sent them
When I get a gaggle of people wanting discs after a show, I designate the most reponsible looking one as the contact and have everyone else work through him/her
I look at it as karma points, I need all I can get these days
But to keep on topic, if you thought trading discs/hds was bad, cassettes with low levels or DATs that wouldnt play or had massive dropouts were a real disappointment back in the day