ID: Multiple DVI to VGA Adapter for Mac Book -Connect Mac Book to Projector or External Display
The following video adapters should work with the MacBook (13-inch, Late 2009) and MacBook (13-inch, Mid 2009).
  Name Model
   Mini DVI - VGA Adapter  M9320G/A
  Mini-DVI - DVI Adapter  M9321G/B 
Support Information:
http://www.apple.com
The MacBook (13-inch, Early 2009) and MacBook (13-inch, Mid 2009), like previous polycarbonate MacBooks, offer a mini-DVI connector for use with external displays. These MacBooks continue to work with the popular DVI and VGA video formats through the use of the mini-DVI to VGA and mini-DVI to DVI adapters. However, these MacBooks do not work with S-video output or composite output using the mini-DVI to Video adapter. 

Note: Previous MacBook models may use the mini-DVI to video adapter. For more information on video adapter compatibility please refer to Monitor and Display Adapter Table on the Apple Inc Website
Date: Multiple
Price: $ 30 if purchased separately. Normally included with Mac Book purchase.
Vendor:

Apple Computer Inc.