The first used X-E1 are now available at the Amazon Warehouse Deals. You can save up to $153 if you purchase a used X-E1. Click here to see them.
I’ve also searched for used X-E1 worldwide via slidoo (click here).
P.S.: Andreas Dantz ordered the X-E1 and the Canon 6D. He received first the X-E1, shot some images, and liked this camera so much, that he is now going to cancel his Canon 6D pre-order at Amazon. Read the reasons for his decision here in his blog (translated version).