Yes I did find these sites but they are all exporters, min order 100 pieces. I contacted the manufacturer but got no reply. They do not seem to make the 400 any more.
I ordered a replacement card from ebay which IS a clone, KMC4400. It works, the drivers are slightly different but the software is OK with the card. My worry was that if I replaced the card with something different, I would have problems with the software. The software, like the card is a mystery as far as information and documentation is concerned.