I am hearing repeated stories of the FT817ND being in short supply from various dealers in the UK. One rumour is this is due to component supply shortages so units are not arriving from Japan in the numbers needed.
Of course there could be another explanation: the rig is about to be replaced at long last. It is not unusual for dealers to be told to run down stocks of the older models which will be harder to shift once a newer model becomes available, except with significant discounting (think of the iPad3). Once a new model arrives sales will go sky high.
Now, I have no information at all, so don't write to ask me, but I would dearly love to know the truth.