Amazon.com : Saramonic CaMixer Microphone Kit with Dual Stereo Condenser Mics, Digital Mixer & XLR/Mini-XLR Input with +48V Phantom Power Preamp - for DSLR Cameras and Camcorders : Electronics
Sound Skulptor: MP-AB528 Microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP-AB528
Amazon.com: Tonton High Sensitive Weatherproof Preamp Microphone Audio Pickup Device Sound Voice Pickup Kit with 60 Feet Cable and Power Supply for CCTV Surveillance Camera System : Electronics
Sound Skulptor: MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP566
Mic Preamp Kit - Electronics DIY Projects PCB
Hardware Blog: SC-1 Mic Preamp Kit - Blog - Octopart