As a starting point, you could look at the WACC for the industry as a whole or for a few comparable peer companies.
FYI, Morningstar sells industry-specific WACC reports for $100. Available on-line for immediate download…
http://corporate.morningstar.com/ib/asp/subject.aspx?xmlfile=1426.xml
“Industry Analysis Reports
During the valuation process, professionals can quickly find trusted techniques and calculations in the Cost of Capital Resources Center. Its collection of industry reports explores U.S.-based industries by SIC code and includes:
Analyses of approximately 350 industries per quarter, dating back to 2001, from the Ibbotson® Cost of Capital Yearbook
Five separate measures of cost of equity and weighted average cost of capital
Detailed statistics for sales, profitability, capitalization, beta, multiples, ratios, industry returns, and capital structure
Explanations of formulas used to calculate cost of capital “