If you go onto the
Creative Commons site, you will find a whole bunch of photographs offered for use with or without
certain restrictions and conditions. Many of them are taken by amateur photographers or semi-professionals who ask for no more than a minor mention, and in some cases a link back to the original photo and information. Many of these images are in the photostreams of the flickr community. However, if you do use these photographs, please
play fair and make sure the author knows you are using them and has given you permission to do so. It could well save you a lot of hassle at a later date.
Personally I did a photography course so as to be able to
handle a camera with confidence and take my own pictures in order to avoid any
problems with copyright. Using a digital camera is really very easy, particularly if you stick with a bridge camera or similar. You will probably never need really high quality images on the web (slows the page down too much) so even the best photographs will need to be optimized anyway.
But otherwise as already suggested, you can use a search engine to come up with lots of alternative sites for stock images.