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Here you can find betas for many sectors, by Prof. Damodaran from NYU: http://people.stern.nyu.edu/adamodar/New_Home_Page/datafile/Betas.html
Thanks Daniel, one more question. which beta value should be taken for DCF Valuation? Average beta or unlevered beta or unlevered beta corrected for cash? I am preparing one, so your answer will be helpful. thank you!
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Sorry, I didn't see your second question before. Wich beta should be used depends on the multiplicator, I mean wich cash flow are you discounting. Depending on for-who are the cash flows, the discount rate must be different, so the beta you have to use to calculate this in a CAPM approach will be one or another.
They are also used for valuation of a non-public company by comparison with a similar (or a group of similars) public company. You can use the average beta if the debt levels are similar, if not, you should deleverage the value of the company and use the unleverage beta.
It's pretty complex and I don't know good resources in the web to sugest you, you can start here: http://en.wikipedia.org/wiki/Hamada%27s_equation and then gloogling for more. Hope this help you, despite the confusing of my response :D