For a better pretend purchase, create an alternate id. (Free member as an art collector). You'll need a different email address to do this.
Doing so will allow you to see the full price, including your commission, as it would be seen by anybody other than you.
When you pretend to (or actually) buy your own art under your own artist-id, the commission is deducted, so this affects the total price.
I think that you will find that international shipping fees are quite expensive.