iStock offers millions of affordable, unique, royalty free images and stock photos. Images can be downloaded using iStock credits, which are sold in preset packages. iStock allows you to download photos, vector illustrations, video, audio, and flash files to use on your website.
iStockphoto’s illustrations are a little more vector-based and slightly more stock-like than most on this list. But its range is extensive and relatively inexpensive.
To purchase these files you must first buy credits, which start at around $11 per credit. For larger quantities, subscriptions are available and start at around $199/month which allow you to download 250 images per month.