If you're interested, check out the following pay-site for a decent database of DVD unlock codes. It's got a few machines that other sites don't feature, so I'm recommending it, as it unlocked my Matsui. Some of them seem pretty old, but there's plenty to choose from.
It's actually got a Sony unlock on its free page. I don't know whether it works though, as I heard Sony machines can't be made region free with a handset code? Can somebody verify it who has a Sony machine? Anyway, here's a link to the free page - the DVD unlocks might be of some use to you.
[Link: dvdexploder.com]This message was edited by freebase on 09/23/04 08:34 ET.