MeiKe MK-D3100 Battery Grip for Nikon D3100 D3200 | MeiKe Store
Vello BG-N12 Battery Grip for Nikon D3100, D3200, & D3300 BG-N12
Amazon.com : BIG MIKE'S ELECTRONICS Battery Grip Kit for Nikon D3100 D3200 D3300 D5300 Digital SLR Camera Includes Qty 2 Replacement EN-EL14 Batteries + Vertical Battery Grip + More!! : Electronics
Amazon.com : Neewer Professional Vertical Battery Grip Replacement for Nikon D3100/D3200/D3300/D5300 SLR Digital Camera, Works with 1 or 2 Pieces EN-EL14 Batteries : Electronics
Nikon MB-D3100 for Nikon D3100/D3200/D5300 Battery Grip by Wasabi Powe – Wasabi Power