Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics
Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215 : Electronics
Amazon.com: Logitech MK320 Wireless Desktop Keyboard and Mouse Combo — Entertainment Keyboard and Mouse, 2.4GHz Encrypted Wireless Connection, Long Battery Life (Discontinued by Manufacturer) : Electronics
Logitech USB Unifying Receiver - Micro Center
USB Receiver RECEPTEUR Logitech C-u0006 810-001811 for Mk320 Wireless Keyboard for sale online | eBay