Amazon.com : Movo Smartphone Video Kit with Audio Mixer Preamplifier, Shotgun Microphone, and Smartphone Grip Handle for Apple iPhone 5, 5C, 5S, 6, 6S, 7, 8, X (Regular and Plus), Samsung Galaxy,
Mic Match Preamp - Banjolit
VideoSecu High Sensitive Preamp Microphone Audio Pickup Device Sound Voice Pickup Kit with 100 Feet Cable and Power Supply - VideoSecu.com
Sound Skulptor: MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP566