iStock
iStock is an online royalty free, international micro stock photography provider based in Calgary, Alberta, Canada. The firm offers millions of photos, illustrations, clip art, videos and audio tracks. Images cost between 1 and 3 credits, with the price of credits ranging from $10.00 to $0.22 depending on volume purchased and subscription plan.). Artists, designers and photographers worldwide contribute their work to iStock collections in return for royalties. Nearly half a million new photos, illustrations, videos and audio files, are added each month.
Source: Wikipedia
