I wanted to buy 12 units awhile ago, but then I got laid off and I've been in college ever since. Now they're gone from Plextor's online shops, including the Japanese branch.
There's auctions for individual drives (some of them new - many of them used), but no opportunities to save on shipping by purchasing many drives together.
Oh well. At least I got my one Japanese Premium2 when I did. I'm also not dissatisfied in the least bit about owning 6 original Premiums, because they're still doing a damn good job even today.
Now the real question is, will Plextor themselves make anymore drives at all? If so, then what would be next? A Blu-Ray drive that can fully overread audio CDs? We can always dream.