USB Only
Does best Buy sell the USB adaptor for this keyboard? I own the keyboard and the USB adaptor broke and has been misplaced...
I don't know if you can buy just a Logitech Unifying receiver, but you can buy a cheap Logitech mouse (http://www.bestbuy.com/site/logitech-m325-wireless-optical-mouse-blue/3937943.p?id=1218443144549&skuId=3937943) and reconnect the keyboard to the receiver that is in the mouse package.