Just browsing the Amazon.co.jp site and find this:
http://www.amazon.co.jp/exec/obidos/...638937-9125061
The rest of the films have covers very similar designs and are very nice and I have ordered the whole set. It is very hard to find the covers to the other films but they are pretty cool.
Ordered all 4 for about £65 with the normal delivery.

I got my R3 set from Korea today. The coverart is, of course, the teaser poster art (or similar to it). They're in clear two-disc amaray-style cases with very little Korean to be seen, except for the title in pretty small text on the front cover, and also on the spine.

It ended up costing me $58.78 shipped, which is only about $5 or so more than I would've had to pay here (once I include tax and gas), so it works out for the better, I believe.

EDIT: I just noticed that the coverarts are actually reversible. The other art is exactly the same, except there's no Korean at all on the front cover, and none of the special features or warnings or anything on the back, just the normal picture that is there, and the quote from a magazine or whatever.

EDIT 2: However, after swapping to the reverse coverart, I now see that there is no text on the spine at all. :(

Sounds pretty cool, Shagrath! Do you have any way to take pics of the reverse covers?