http://www.jangle.org/123rf-a-quick-review/

123RF is one of the most affordable MicroStock solutions on the net. Although they do offer high-resolution images, they offer low-resolution images as little as $1 a pop. One might think that a library that has 37 million images is considered a large library. However, they have one of the smallest image libraries when you compare them to some of the other stock photo agencies online.