The price of each photo is given by two issues:

Its size and its license (which can make use of the photograph), the license prices also vary by agency.

The price of the photos shown in the currency (dollar or euro) or credit (one credit equals one U.S. dollars or euro - depending gives each agency).

A photo can cost from a credit to smaller sizes of standard license (sufficient if he has to design for web or small print) and even many made for very large sizes, and licenses issued.

The price of each photo when it comes to the subscription system may be as cheap as 0.17 euros, depending on the type of subscription contract.

But almost all the agencies periodically offer free photos and illustrations with the only requirement to be registered user.