The Nagaoka cameras are pretty much identical to the Anba Ikeda camera, the only difference being that Anba cameras have red bellows, while the Nagaoka's are black. Both the Nagaoka and the Anba are very compact and lightweight (less than 3 lbs), but are not very rigid. The Tachihara and the Wista cameras are a bit heavier, but are much more solid, and have better movements.
I had one for a few years, combined with a small tripod, 150mm G-Claron, and two graphmatics it made a very lightweight travel kit which easily fit into a small backpack. On the other hand, I often found the limitations of the camera (12" bellows, limited rise/fall, very limited swing) infuriating.
These tend to sell for about $400 on eBay, which is probably the best place to locate one.