I am looking for images of people meeting, talking, on computers and off, with cell phones, outdoors, indoors for use in a young educational website and am willing to pay $10 - $20 each. Its hard to find a good site to buy from as there are so many out there. Any recommendation(s) would be helpful.
I think this is off-topic here, but simple Google "stock images for non-profit". For example this has a good overview