Amazon.com: 2PC Replacement Keyboard Foot Stand for Logitech K520 MK520 Wireless Keyboard, Logitech MK520 & K520 Keyboard Feet Stand : Electronics
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
Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 - Walmart.com
Logitech MK520 Wireless Keyboard and Mouse Combo — Keyboard and Mouse, Long Battery Life, Secure 2.4GHz Connectivity Keyboards - Newegg.com