The oldest Microsoft Natural keyboard model I can purchase new at the time, currently a 4000 model [1], along with the basic Microsoft Optical Mouse [2]. They'

The oldest Microsoft Natural keyboard model I can purchase new at the time, currently a 4000 model [1], along with the basic Microsoft Optical Mouse [2]. They're both fairly cheap. 1. https://www.microsoft.com/accessories/en-us/products/keyboards/natural-ergonomic-keyboard-4000/b2m-00012 https://www.microsoft.com/accessories/en-us/products/keyboar... 2. https://www.microsoft.com/accessories/en-us/mice https://www.microsoft.com/accessories/en-us/mice