I know from experience that the shopowners (especially the European) like ADT's own Jacco: https://www.adultdvdtalk.com/jacco
from:
http://www.yourchoice.nl/
are very helpful in answering/replying your e-mails/questions.
If nobody else answers you here, you could also ask at their own forum (It's very active, with lots of members discussing all sorts of stuff):
http://forum.kink.com/indexpa
Im also not a fan of on demand computer files, but if you wont find any physical dvds you could also watch online (well updated section):
http://www.kinkondemand.com/kod/shootsp?nats=MDowOjIx
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