To get an idea of how much a per-page rate would be, try this estimator. This is only for plain and simple back-of-the-book indexing. Technical projects are usually handled by hourly or hybrid rates. (Thanks to Charles Anderson of The-Indexer.com for the codes!)
What is the total number of indexable pages in your project?
On the average, how many significant concepts/terms/names are there per page?
On a scale of 0 to 10, with a 0 being a simple trade publication (Example: How to Win the Hearts and Minds of Dogs, Tai Chi for the Health of It, Beginning Microsoft Products for Everyone, etc.); a 5 being something on the level of a college textbook or a manual on databases; and a 10 being an extremely complex technical work (Example: The Thermodynamics of Domestic Hot-Water Systems, USB Engineering Specifications), at what level would your project be?
Based on the information you have provided, the costs could run between $ and $
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