Amazon.com: Logitech USB 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
Best Buy: Logitech K360 Wireless Keyboard 920-003320
Amazon.com: Logitech USB 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
Logitech K360 Compact Wireless Keyboard for Windows, 2.4GHz Wireless, USB Unifying Receiver, 12 F-Keys, 3-Year Battery Life, Compatible with PC, Laptop, QWERTY UK English Layout - Black : Amazon.co.uk: Computers & Accessories