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 & O`Reilly Online Learning ,ebook databases, both contain 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.
