The place I went for all my NJS kit is yahoo auctions. Complete bikes are not so common, but there are plenty of frames on there and you can build up from there
I got a brand new Panasonic custom frame for 50000, Araya gold rims laced on Suzue Promax hubs for 18000, Sugino cranks for 15000, bars/stem for 6000. Very happy with all that I purchased. Never had a problem buying on there.