What is the average size of a water fountain?

"The cost of having a garden fountain installed depends upon many factors: the size of the fountain, the distance between the controls and site of installation (for both Plumbing and electrical). The cost of installing a smaller garden fountain by yourself (for example, a bird bath) can be as little as $100 in materials you can purchase from your local Home Improvement store. As far as professional installation, quotes vary depending on the work needing to be done."