Depends on what you're shipping. Most decor ships at $7.25 per item. Art will vary depending on its size, whether or not it's mounted, and how it is mounted. If you are asking what FAA's actual shipping costs are, that we have no idea.
Akos select a picture with the size and format you are thinking off and go through checkout putting in the address it will ship to - before you go through payment it will show you the shipping cost then just cancel it without paying. You can do this with several formats and sizes to get an idea.