There may be some guys on here who could help with the Hungarian auction site
http://www.vatera.hu/. A disk interface is the sort of thing that will turn up on there much more often than the UK, and it would be cheaper, even with postage!
Although your best bet may be to wait for me to get the SD card "hard drive" interface done. Unfortunately I can't make any promises or estimation on when this will be done, as it's purely a spare time thing, and I don't get much spare time!
Good to see another UK Enterprise.