Site for images

At my internship, we did a quick search for a place to find images other than istock, due to istock prices. We found the site http://www.dreamstime.com/free-photos. The images aren't that bad. There are not as many as Istock, and not as good, but for a quick filler or some searching, some images are pretty good. Also, it allows you to upload pictures and either get paid or get credits if they choose your image.