title_body: Where can I source images for ebooks that are not restricted by reproduction limits nor dpi? As you are probably aware, most image vendors restrict you to the number of reproductions you can make using their images. Many have additional licenses that you can purchase, but they are often exorbitantly priced (specially if you need to use many images-like myself). They also generally have some form of size restriction such as don't use images over 72dpi. 
  
  Question
  
  Where can I source images for ebooks that are not restricted by reproduction limits nor restricted to 72 dpi?
  
  UPDATE
  
  I don't mind paying for images as long as the prices aren't exorbitant.
  
  MY OWN RESEARCH
  
  Flikr allows you to search specifically for content that is ok for commercial use and is licensed under the creative commons licence. http://www.flickr.com/search/advanced/?
upvoted_answer: It depends from the type of images you need, but I'd suggest to have a look at openclipart. Its great advantage, besides containing images with an open license, is that they are stored in vectorial format (SVG), so they may be scaled at will.