Man, to think that the FDS was only around 150 J-bucks when it first came out. (I have no idea what the $->Yen was back then) Compared to today's standards (where new systems run $200-300) that's insanely cheap. And to think that the disks were only 500 yen each!? That's awesome.
Although, with inflation, everything probably equals out to why stuff is so more expensive these days.
Awesome find, Ultra!