<b>Thunder</b>, there are no books I'm aware of priced at $500 or greater. Value of real nuts & bolts info starts above there. Not to give a public plug in violation of spam policy here, but I know of several successful emini traders who bought info priced around $4,000 from someone in Texas :eek: who teaches various chart patterns to trade. While it isn't something I personally use, the info there can provide a very sound basis for trading success.
Likewise, there are brief courses for sale in the $500 area from proven traders that give a solid base to operate from. One example is a 1,2,3 pattern course offered by a high-profile veteran trader, which definitely works.
In certain market conditions I use that specific info to catch moves in the ER that otherwise run away from any other signal. I spent $395 for the CD, and it has returned many times that cost in a few ER trades this year alone. Might even use it today, should the markets get surprised by FOMC and start blowing up or down the charts real hard.
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As for the $20 to $50 books? All I've ever read offer nothing to me at this point of my career, exception being Bulkowski's on certain price patterns applicable to short-term trading.