Hello-
I don’t know if this has been brought up as an idea before or not, but here goes.

I am a member of a couple of trading circles that trade in live recordings of music. One of the things done to trade is create a vine.
Usually there are two copies that start with the originator. One goes to people in the us and the other goes to the rest of the world (ROTW)
Anyway, a vine is offered and people sign up, then it starts, it is mailed from person to person. each person copies it and sends it to the next. The last person on the vine keeps the disc.

This is a great way to faciliate trades and for people who can not find the things they are looking for, they can request or just wait for a vine to be started.

a typical vine sign up looks like this:

US
1.
2.
3.
4.
5.

etc.

ROTW
1.
2.
3.
4.

user name and e-mail address, then when you get it, you e-mail, get the snail mail addy and send it off.

just an idea from another trading circle.