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Most knives we throw are pretty pricy. You get what you pay for, or in my case, trade for.
Good set of competition throwing knives will run you close to $300 bucks. Usually they can be thrown by the handle and by the blade for 1/2, full, 1.5, 2, and many more turns.
Most competitions you will need 5 knives, so many will sell you 4 and throw in the 5th one at no charge.
I did go out and purchase 5 "cheaper" bowies, and was not that happy with them. Matter of fact, I gave them away. Just can't stand crap.
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Here is an old article for ya.
http://www.danwashburn.com/throwing.html