Where to get icons or bitmaps for the BindingNavigator and other controls?

I am using the BindingNavagator in my application and need a simple 'Save' icon.  I unzipped the image library that came with VS 2008, and I couldn't even find a save image!  What are developers using these days for images, where can I get them, and what is the most used type (ico,bmp etc.)?  The icons for the Binding Navigator need to be 16 x 16, but I will need other sizes, too.

Thank you!