Price is 250 USD. It works with TS 8.1 and TS2000i.
It's well-known as Sigma Bands ToolKit for Tradestation.
Click this book and download manual in PDF format . 
You need to have Abobe Acrobat Reader installed on your computer. You can download free copy on http://www.adobe.com
Web site of vendor : http://www.janarps.com/HurstChannels.htm
This Tool Kit includes the following indicators:
1) SIGMA INNER CHANNEL {Plots the centerline, the inner + and Sigma bands, and the red LR line.}
2) SIGMA OUTER CHANNEL {Plots the outer two + and - Sigma bands}
3) SIGMA MOMENTUM LINES A, B, C {Plots the standard deviation lines converted to straight lines, along with the difference between closing price and (a) the centerline (black), and (b) the red LR line}
4) SIGMA MOM DIFF {Plots the difference between the centerline and the red LR line.}
5) SIGMA INNER CHANNEL RT {plots the progress of the end point of the Sigma Bands inner channel calculations for each bar on the chart}
6) SIGMA OUTER CHANNEL RT {plots the progress of the end point of the Sigma Bands Outer Channel calculations for each bar on the chart}
7) SIGMA CENTERLINE RT {plots the progress of the end point of the Sigma Bands Centerline for each bar on the chart}
Prices tend to regress toward the mean, which is represented by the blue centerline on the Sigma Bands chart. The three curvilinear bands above, below and paralleling the centerline represent one, two and three standard deviations of the actual data points from the mean centerline. There is only a five-percent chance that prices will exceed the 2-standard deviation line, and less than a one-percent chance that they will exceed the 3-standard-deviation line. So, when prices reach these bands, a relatively low-risk entry opportunity presents itself to trade in the opposite direction of the current move.
Additionally, a red momentum line is shown on the chart. When the centerline diverges from the red momentum line, the overall trend will be in the direction of the centerline relative to the red line. When the red momentum line and the centerline are close together and more or less parallel, a trendless market condition exists, and it is best to stay out of the market.
Please read manual to get more information.
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