Almost, but that device doesn't actually 'dup' anything, as the user is required to peruse the source device on the lcd screen and select files.  Still, you did find one for sale, which is something I wasn't able to do.  PM me your address, and I'll send you a nickel.

EDIT: according to the reviews, it also can't power a usb device and is notablely slow, so it wouldn't fit the bill.  I want a device that can copy at full usb 2.0 speeds, as well as provide enough usb bus power to light up two thumbdrives.  It's for this project...

http://deaddrops.com/

So that I (or anyone else) can walk up to a deaddrop location with this device and a thumbdrive with a respectable amount of freespace, plug it in for a couple minutes, and take off without ever having to stand there with a laptop in the open.  If the user wishes to place something on the deaddrop, he just turns the device around and uses his own thumbdrive as the source.