Try DVDmode.com. They are selling it and I know they ship to the USA, because I got my Seson 5 X-Files set from them And I got really good and fast service, by the way.
I've had good luck with DVDBoxOffice.Com--I've ordered the Canadian Alliance versions of Good Will Hunting and Pulp Fiction from them, along with the now-OOP Patton two-disc set, just a few months ago (around $21, IIRC). Only three things total, but I've been very pleased so far. www.dvdboxoffice.com
-mwb-