Olympus ME-9 Clip on Microphone with jack adapter - Walmart.com
Olympus Electret Condenser Microphone w/Cord - Case Included..R55 | eBay
Amazon.com: Digital Camera External Microphone Compatible with Olympus Pen E-PL9 Mirrorless Digital Camera, XM-AD2 Dual Channel XLR-Mini Audio Adapter for DSLR's, Camcorders and Pro Video Cameras : Electronics