They are quite hard to find ,however if you do an EU wide search you might get luckier. I got mine from Belgium for a fair price.

On the other side, you could also buy them from ebay US, although of course the posting might be a little pricey or too slow.

However, you can always use an SCSI to Ethernet adapter as it has already been mentioned. I have a couple, and I'd be willing to sell you one if you wish.