The new Sony GP-X1EM Grip Extension will cost you $130 at Adorama, BHphoto, Amazon. But there is an alternative. Our reader Alex Gee just sent me this message:
I’ve just made a 3D printable grip for the A7ii and A9 cameras. I’ve put it on shapeways for $40, so it’s quite a lot cheaper than Sony’s one.
shapeways.com/product/2676H4F7B/sony-a7ii-a7rii-and-a9-grip-extension
Cool 🙂