Meike MK-D600 - Battery grip for Nikon D600 and D610 - Camera Gear
Amazon.com : Nikon D610 24.3MP DSLR FX-Format Digital Camera with AF 50mm f/1.8D Lens (1540) Deluxe Bundle with 64GB SD Card + Large Camera Bag + Filter Kit + Spare EN-EL15 Battery +
Nikon D610, Battery Grip, WU-1B WiFi dongle: For Sale and Wanted Forum: Digital Photography Review
Amazon.com : Nikon MB-D14 Multi Battery Power Pack for Nikon D610 and D600 Digital SLR : Digital Camera Battery Grips : Electronics
Amazon.com : Battery Grip Kit for Nikon D600 D610 Digital SLR Camera Includes Qty 2 Replacement EN-EL15 Batteries + Vertical Battery Grip : Digital Camera Accessory Kits : Electronics