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
BG-D5300 Vertical Camera Battery Grip Holder for Nikon D5300 D3300 D3200 D3100 | eBay
Amazon.com : Phottix Battery Grip BG-D3100 for Nikon D3100 and D3200 : Digital Camera Battery Grips : Electronics