Amazon has the GreenWorks G-Max 40V 20" Cordless Pole Hedge Trimmer for a very attractive price of $32.90. If you already have that series of equipments from GreenWorks, it’s a great addition.
https://www.amazon.com/GreenWorks-22342-20-Inch-Cordless-Included/dp/B00D3KJM44/ref=sr_1_1?ie=UTF8&qid=1494434420&sr=8-1&keywords=22342