I bought this yesterday http://www.cdrking.com/?mod=products&type=view&sid=21638&main=167#.VdhuKN9_c8o. It's a mouse and keyboard with one usb receiver. The keyboard is working perfectly ...
Similar question have been asked before, but there were no answers. I cannot comment there, nor I have an answer, therefore I don't see other option but to ask again. I have a USB laser presenter ...