Retailer:
Dell

 

https://www.dell.com/en-ca/shop/microsoft-wireless-desktop-850-for-business-keyboard-and-mouse-set-wireless-24-ghz-canadian-english/apd/a8808488/pc-accessories

https://www.dell.com/en-ca/shop/microsoft-wireless-desktop-850-for-business-keyboard-and-mouse-set-wireless-24-ghz-canadian-english/apd/a8808488/pc-accessories

I just dusted off a surface pro 3 and noticed that it has only 1 usb…this meant that I need a wireless keyboard/mouse combo, so I googled around and this appears to be the best deal right now.