If you are patient and pick your time you can pick up some of the original vinyl issues at reasonable prices. Amazon had a box of leftover NLOTH stock for £21 a couple of months ago. I managed to get a copy of "Pop" for £50, which is the highest I have gone.
Try getting a copy of "best of 1980-90" or "90-00" for under £100... that's a tough job.
The band should really do a set of limited vinyl reissues i.e. a three month ordering window, and run a pressing to pre-orders & some leftovers only. That would drive out the 'unofficial repressing' market.