http://nihonto.com/ichi.html
here's a 90k shirasaya
swords are handmade and much different from your conventional knives.
display swords can be bought for real cheap, though they tend to be machine made and cheaply made, with cheaper ****l.
minimum neccessities for a functional sword for cutting/practicing are
1.steel quality(high carbon being the cheapist though not neccessarily lest functional). avoid stainless steel cuz they are brittle
2.the shape, thickness, full tang, etc. craftmanship in general.
3.sharpness, depending on whether u just want to swing it in the air, maybe light spar or do theatre work, or actually cut somethings with it. if you feel a real sword, u'd probably be surprised at how sharp they are(sharper than ne ktchen knife you'd probably ever see and around razor quality)
all those usually add up to a sword around 150-600. things such as custumized length, handles, engravings, stingray rayskin, buffalo horn, leather, damascus steel, etc, make swords way more expensive.
http://www.martialartswords.com/prod...products_id=43
here's a site which shows how much extra custumizations can cost.