Base Price per product, not per quantity

Is it possible to have one flat fee per product type, not per number of products? I don't see it in the system.

My setup is as follows:

Shirt: $18

Digitization of the uploaded image: $25   (This is not per product)

Each imagelogo) Added per shirt: $20

So for example, If a customer orders 10 shirts, the only pay the digitization fee ($20) once. 

So their total would be:  ($18 x 10shirts ) + ($20 x 10 shirts) + $20

They only pay the digitization fee once, not 10 times.