Amazon has the DJI Mic Mini (2 TX + 1 RX) Detail-Rich Audio Wireless Lavalier Microphone for Camera/Smartphone for $59 with Free Shipping for a limited time.

The DJI Mic Mini features transmitter that is small and ultralight, weighing only 10 g, making it comfortable to wear, discreet, and aesthetically pleasing on-camera. The Mic Mini delivers high-quality audio. A 400m max transmission range ensures stable recording, even in bustling outdoor environments like a busy street. It seamlessly works with DJI ecosystem of compatible cameras and Android and iPhones with USB-C connectors. It has 2 noise cancellation levels available—Basic is ideal for quiet indoor settings, while Strong excels in noisy environments to give you clear vocals. The transmitter and a receiver offer a maximum operating time of 10 hours.