Amazon.com : Phottix Battery Grip BG-D3100 for Nikon D3100 and D3200 : Digital Camera Battery Grips : Electronics
Amazon.com : DSTE Replacement for Pro IR Remote Vertical Battery Grip + 2X EN-EL9 Compatible Nikon D40 D40X D60 D3000 D5000 SLR Digital Camera : Digital Camera Batteries : Electronics