Microphone Adapter Cable Durable Camera GPS Part For Nikon D3100-D7100 COOLPIX | eBay
GPSN Pro Micro Camera GPS Tracker Receiver For Nikon D800/D3200/DS90/DA7100/ D5200, D4/DF600/FD5100,D7000/DD300/S With From Goodgo, $84.49 | DHgate.Com
JYC N-769/N3 Camera GPS Receiver Geotag GP-1 + JYC wired shutter release SR-C1 for Nikon D90/D3100/D3200/D5000/D5100/D5200/D7000/D7100 | Eachshot.com