You have PhotoPoints
What are PhotoPoints?
PhotoPoints is a system for purchasing credits that allows you to manage and acquire images as needed. If you are purchasing more than one image you can save on the price per image.
PhotoPoints will be deducted from your account according to the cost.
You can at any time still purchase an image directly with a credit card. Generally the ratio of file size to PhotoPoints will be as follows:
Many images cost as little as 2 points.