Stock photos services to illustrate your websites, articles
If you need to illustrate an article or a website you don't need to hire a photographer or graphist. For a lower cost you can easily browse online stock images services and buy online the photo you will use for your next blog post.
These websites, that sell images for your illustrations, will allow you to pay using credit cards or paypal. Each service have their own pricing model, but they usually have a pay per image option or a monthly subscription with an images limit to download per day or month.
If you are a photographer, some of these stock services, allows you to submit and sell your photo for you (See the "User contributed images").