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
NEEWER Vertical Battery Grip for NIKON Work with EN-EL14 - NEEWER – neewer.com
Amazon.com : DSTE Replacement for Pro IR Remote MB-D31 Vertical Battery Grip Compatible Nikon D3100 D3200 D3300 D5300 SLR Digital Camera as EN-EL14 EN-EL14A : Electronics
Canon Battery Grip BG-E4 (BP511, BP-511A) at KEH Camera
BG-D5300 Vertical Camera Battery Grip Holder for Nikon D5300 D3300 D3200 D3100 | eBay
D3100 battery grip to use on d3200?: Nikon DX SLR (D40-D90, D3000-D7500) Talk Forum: Digital Photography Review