I'd love too, but some of the shit I'm into is pretty underground so I can't find it anywhere.
You won't believe how fucking hard I've looked for some Burzum albums.
Amazon and eBay, and most other large online stores, have Burzum's music for sale. You clearly haven't looked very hard. I assume that you haven't heard his music, because you'd most likely hate it based on what I've seen of your music taste so far.