Stock photo links

Here are a few of the stock photo sites that I use:
iStockPhoto (Here’s the list of their free images, vectors and video)
BigStockPhoto(Free photos)
ShutterStock ($$$ Their current terms of service are a minimum of $275 for 2 months)

You can create an account and save images to a lightbox, which is great for building categories of images and sharing groups of photos with people.