Logitech MK520 Complete Wireless Combo K520 Keyboard and M510 Mouse USB Unifying (920-008972) (Renewed) (920-008972-cr) - Newegg.com
Logitech Wireless Combo MK520 | Nebraska Furniture Mart
Best Buy: Logitech MK520 Wireless Keyboard and Mouse Combo Black 920-002553
Logitech MK520 Wireless Desktop Set - Keyboard/Mouse, USB, Includes Unify Receiver, Black - 920-002553 at TigerDirect.com
Logitech 920-002553 MK520 2.4Ghz Wireless High-performance laser upto 3 years battery life Unifying receiver Keyboard & Mouse combo - Walmart.com
Viziflex Seels SID8AKSUUY Keyboard Cover for Logitech K520 Keyboard, Keeps Out Dirt Dust Liquids and Contaminants - Keyboard not Included - Part# 546G114