Took quite a while to find a copy at reasonable price, and it still wasn't cheap, but I am now very happy to finally own it.
An updated picture of my Boris collection:
Boris at Last -Feedbacker-
Smile (US Version)
Heavy Rocks (2011)
Which not counting collaborations, is still only eight out of nineteen. Twenty if the Japanese and US versions of Smile are counted as separate, which they should be.
So still a long way to go, but with most of the rest being Japan-only releases, I'm not getting my hopes up for getting anything else in the near future. The price for imports of some of their albums go up to the hundreds here.
Plus, some of those albums are vinyl only. Now, Japan-only CDs are really expensive as is. Japan-only vinyl is a different beast altogether.
For now I'm just hoping that some of their older albums get reissues with world-wide releases.