A Google search turns up quite a few on eBay and from what I remember, used to have a Janome 8000, the cards fit both machines.
After the 8000, I had a Janome 300e which was easier to use as could make use of generic blank 'flash cards' in a separately purchased adapter. I don't think that the 8000/9000 could make use of the generic cards from what I can remember. They also had a VERY low capacity in terms of Mb, a problem that I'm having these days with my MC11000, which only likes low capacity usb sticks - 2 Mb or so