Wikipedia
IStock
iStock is an online, royalty free, international microstock photography provider operating with the micropayment business model. iStock offers millions of photos, illustrations, clip art, videos and audio tracks. Images cost between 1 and 150 credits, depending on size and image collection (with credits ranging from $0.95 to $1.50 USD each). Talented artists, designers and photographers worldwide contribute their work to iStock collections. The global community of over 140,000 artists create and submit nearly half a million new photos, illustrations, videos and audio files, each month.