These small kreations are very labor intensive with each one taking from 20 to over 100 hours.  I rarely sell them and when I do it is to purchase supplies or to fund the purchase of new equipment.  Commissioned work starts at 100.00 for a basic build.  Cost is higher depending on the complexity of the project and the amount of scratch building.  That said, keep in mind you are commissioning a one of a kind piece of art.  No two pieces are alike.   If you are interested contact me.