U.S. Census Bureau (census.gov): A source for a variety of useful statistics, especially the Economic Census that comes out every 5 years.
While these are easily available online, some of them are way better than the others. A lot depends on the approach that goes into writing the business plan.
So, rather than looking around for an existing plan and then designing your own plan along the same lines, it would be a better idea to use software that allows you to create your own template.
It is a software program that provides step-by-step guidance throughout the process of planning and provides clear instructions and sound advice, along with resources for any additional help that may be required. It provides easily generated financials that are based on an underlying built-in financial model that is integrated with visual forecasting, and financial wizards to fill in the numbers in the pre-designed format of the business template.
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