I've got some Pink Floyd non-commercial "bootlegs" from the BBC (not selling, so don't ask
). Stuff pulled from old masters. Clear as anything. Great stuff.
If you like Pink Floyd and live music take a look at some of the online concert/bootleg sharing communities. A lot of this stuff you don't have to trade for. And never pay some asshat on Ebay for a bootleg, no matter how great it is (radio promo, pre-FM, outtakes stright out of the studio, whatever - you can get it for free from these communities as long as it's non-commercial).
We use Direct Connect and bittorrent a lot.