Wow, they seem to be the only retailer who sells this product?
Contacted them for a shipping quote to the US, though doubt that's a viable option for me.
Thanks for the info though!
They are also available, at MODDIY http://www.moddiy.com/products/5%252din%252d3-Device-Module-Hard-Disk-Cage-SAS%7B47%7DSATA-Expander-Enclosure.html. They are about $15 USD more per bay on this site, shipping was very cheap for 4 of them and they arrived in under a week from China. Something to check out if you're thinking of ordering them as I'm not sure what shipping costs from the NL site.
Here is a sample of them used in my Sharkoon Rebel 12 build:
Here is a link to my build: http://lime-technology.com/forum/index.php?topic=21993.0