Logitech Nano USB Receiver Replacement for Wireless Headset Logitech H800 & H600 | eBay
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Electronics
Amazon.com: Zotech Replacement USB Receiver for Logitech MX 5500 Revolution M/N Y-RBF91 (Keyboard), M-RCL124 (Mouse) : Electronics
Logitech Unifying Receiver for Connecting Multiple Devices