Amazon offers Prime members the Boya 3.5mm Electret Omni-Directional Lavalier Condenser Microphone for $13.99 with free shipping. That's the lowest price we could find by a buck. It can be used with smartphones, digital camcorders, computers, and other devices, and features:
  • Clip-on microphone
  • 20" audio cable
  • 65Hz to 18KHz frequency response
  • 3.5mm 4-pole gold plug with 1/4" adapter