I just found another copy from the same distributor on eBay.
http://cgi.ebay.com/TEENAGE-MUTANT-N...em220076463508
The auction still has about 6 days as of when I typed this up.
I'd bid on it but I'm in the US and my DVD player and TV will not play PAL (only NTSC).
I wonder if there's an NTSC version out there...