Try searching for this in Google but something you might not know is Flickr.com allows you to search for Creative Commons licensed images. Just look through it for anything interesting under the appropriate license. Go check out the creative commons licenses at creativecommons.org which everyone in this day in age should be aware of.
Good small stock photo website is http://www.photo-wizard.net Here is where you can find some other inexpensive stock photo directories: http://www.small-business-software.net/stock-photography.htm Another site list can be found here: http://www.webmaster-elements.com/webmaster-graphics/photos.htm Goodluck
I'm guessing you are looking for free images not "cheap images" so 100% free image site I use is "sxc.hu" you just have to sign up but you don't have to pay anything ever and you can upload to the site as well.