There is a huge amount of hype and name recognition in the sword world.
Prices are all over the map.
I have met a very well known japanese sword maker who now lives primarily in the US, because the rules in japan limited his production.
Obviously, video gamers and movie fans have clouded the market, bringing all kinds of cheap imitations, hustlers, and phony deals on the marketplace.
I know a guy who deals in very fine used swords, at not that bad of prices for what they are-
http://www.cgfinearts.com/gallery_output.cfm?GalleryID=1
Most of the good sword makers are buffered from the marketplace by layers of middlemen, and, to get a quality piece at a good price, you would need to travel to Japan.
There are many good swordmakers now in the USA, though, and, in some cases, their metallurgy and techniques are actually better than the japanese, who are somewhat limited by tradition.
You have to remember that nobody actually uses a Japanese sword for warfare- they are expensive toys, and the good, handmade ones, are sought after by rich people. You can practice just as well with a piece of wood. Its the rarity, the quality, and the cost that attracts rich collectors, and drives the prices up.