There are many different options for images that affect pricing and logistics of each piece. These may include (but are not limited to) the following:

The type of material they are on including paper, canvas, wood, glass, and metal.

The size and shape of the piece. 

Packaging, shipping and distance. Multiple pieces can also be a factor. 

Due to these considerations, products and pricing are on a case by case basis. Most 16X20 inch canvas prints will be $40 plus tax and shipping.