Hi david.
Do a search in the US eBay stores as there are always a heap of them for sale and sometimes some high speed ones as well for anything from $75USD and up and most sell internationally. I usually buy the DFU/DRU UDX/UDK etc. 5114N ones as they seem to be plentiful. I also have a couple of 5128's bought at around $110USD. New I think are $750USD.
I have most of the manuals for them as well and some are pretty generic to other models.
Let me know if you need anything and I will try and see what I can do for you.
I really like the 5 phase stuff.
Rich.
PS. check this one out on eBay. 290352817241
I am not completely useless.......I can always serve as a BAD example.