Amazon.com : Neewer® Vertical Battery Grip for MB-D15 Works with EN-EL15 Battery or 6 Pieces AA Batteries for Nikon D7100 D7200 Digital SLR Camera : Electronics
Nikon D7100 – Kamerastore
Genuine Original OEM Nikon D7000 D7100 D7200 Battery En-el15 for sale online | eBay
L Quick Release Plate for Nikon D7100 w/ Battery Grip Tripod Head
TUTORIAL | Nikon D7100 Battery Grip - How to Use a Battery Grip - YouTube