And if you ever have a difficult time finding a particular album that isn't in the Audiophile or the aforementioned links, a good ol' Google search will do the trick. Just add "megaupload" or "rapidshare" to the search and you'll get results.
Though I do have a question for the original poster that I always was curious about. What is higher priority for purchase: quality bands that have don't have massive exposure, or the classics? Would my money be better off going towards Averse Sefira's "Advent Parallax", or Burzum's "Hvis Lyset Tar Oss" ? I'm currently a student about to attend college and I don't have the money to support all of the greats. So I'd like to put the money I can spend to where it will count the most.