I have another suggestion, but it will take time, before you know.
When you do a swap exchange, ask your partner to send you the batting info. Then you know what is in it, and can get an idea, of the feel, weight, drape, etc.
A potholder exchange, using different kinds of battings, one or two kinds per person, and exchanging with several ppl, along with the info, could be very helpful for a group. :D
(I'm suggesting this, bc I can't run out and buy a bunch of different kinds either, but this thread has me, very curious now. I would like to know, what I would like the best, too :wink: )