Yes. The Bentley Library has many examples of business plans available.
The Business Plans Handbook: a compilation of actual business plans developed by businesses throughout North America is a multivolume set available online in Gale Ebooks (visit our Databases A to Z menu and choose Gale Ebooks to get started) and older volumes are available in print at the Reference Desk.
Skillport, an ebook database, contains many business plans as well as guidance on how to write an effective one. Just log in and search >business plans<
Use Library Search and enter in the phrase >"business plan"< to bring up a number of additional resources.
