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For free stock art, check out morguefile.com and stock.xchng. You will still have to check the license for each image, some are non-commercial, so if it is a business website, be aware of that and make certain the license is appropriate for your intended use. Getty Images (www.gettyimages.com) charges a fee, but they have a good selection of professional quality images, so I suggest considering that option too, even though you will have to pay.