This site offers a great variety of royalty-free stock images that you can purchase. Royalty-free means that you only pay for your image once and you are allowed to use it as many times as you like just with a few restrictions.
The images that you download can be used for: illustrate websites, decorate your home or office, create advertising posters and any other promotional material of this kind, create unique interior designs, illustrate books and covers, and create company presentations and others. But when you purchase these images, you are not purchasing the license so you don’t have copyright; so you should check what you are allowed to do and what you mustn’t do with these images. After you have checked this, if you want to buy a photo, all you have to do is to register for free, choose you photo and buy it. 
