Miguel Quiles did a battery grip comparison of 2 of the most popular grip options for the Sony A7II/A7RII from Sony and Meike: Sony a7RII with the Sony VGC2EM Grip vs Sony a7II with the Meike MK-A7II Grip.
The Meike battery grip is a great solution for those who want to spend less and you can buy it at Amazon.
Sony Alpha Tips: Battery Grip Comparison For Sony A7II & A7RII
In Unite States:
Follow Sony Alpha a7RII on Facebook: