maybe someone who has bought the new al keyboard would give you the extension cord that was included in it.
I am not sure if there is a cord in every country since I got my keyboard in japan but in my box there was a cool looking extension cord that I use daily.
It's just a standard USB 2.0 extention cable (male-male I think with out looking). Any electronic store should have a generic one, though it might not be slender and white as the apple cord. (if it is behind yore desk anyway does it matter?)