For something similar to that one? About $20 before shipping. And shipping would be $3 to the US, $5 international. I can add other small items to the key as well. The price would just increase a few dollars according to how many extra things you might like, of if you'd just like to to "dress it up" a little fancier. You can see examples of what I can do in my other photos.
Welll....consider that I do not make the charms that I use on my keys. I put tons of tiny pieces into one key to make a whole piece But all of the small parts are purchased in bulk. So it may be hard for me to make something 100% like your drawing. Because each component you come up with has to already exist in the world for me to buy.