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.
Apple includes one with the Mac Pro and I think also with the new keyboard, so you might be able to find one if you ask around of people you know.
Also they're pretty easy to find online. Monoprice has them for under two bucks. (Scroll down to the "USB 2.0 Extension Cable - A Male to A Female" section.)
I bought mine for something like $8 at a local store, but that was a long time ago and I was in a hurry.
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?)