You'll find them essentially impossible. They were produced by a friend of mine in the US in very small numbers for a limited amount of time a few years ago. To the best of my knowledge, the project isn't still on, but it's worth asking.
She might still have a pair kicking around, your best bet is visit her website:
http://www.funksoulkitty.org/ and send her an email. She isn't the speediest to reply, even she admits that, but tell her polov8 sent ya.
![Cool :cool:](./images/smilies/icon_cool.gif)