I'm looking for older usb miners for collecting purposes 
and I'm not paying anywhere retail for them as they're basically all unprofitable.
and I'm not paying anywhere retail for them as they're basically all unprofitable.you are going to open a 'mining museum' ?
To me, Bitcoin related stuff is an especially interesting part of history, because I feel somewhat involved, watching the community grow/etc. I would like to have a few examples around, but I also don't have the money for this sort of thing.
So I will pay only a few dollars above what the hardware is worth in mh/s.