Free Stock Photos
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http://www.freestockphotos.com/ - cool. completely free, just need to provide credit.
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http://www.istockphoto.com/introduction.php - a few free images, the rest are dirt cheap ($0.50 each). Great selection and good quality.
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http://openphoto.net/ - royalty free photos - a photographers personal collection, I think.
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http://pdphoto.org/index.php - another site - public domain.
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http://gimp-savvy.com/PHOTO-ARCHIVE/ - another PD archive - mostly from US gov't sources
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http://www.burningwell.org/gallery/albums.php - another attempt at a free archive
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https://pixabay.com - apparently totally free, creative commons license.
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https://www.flickr.com/photos/biodivlibrary/albums - public domain biological sketches from Biodiversity Heritage Library (BHL)
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https://www.si.edu/openaccess - 3D models and photos from Smithsonian - public domain
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https://unsplash.com - completely free, not even attribution (except for resale)
Cheapish stock photos
Tags: images, stock, photos, pictures