Ebay offers Synco WAir-G2-A1 Compact Digital Wireless Microphone System (2.4 GHz) for $89.99 (reg $129) with free shipping.

Product Description:
The Synco WAir-G2-A1 is an ultracompact, single-channel digital wireless microphone system great for shooting videos for Instagram, YouTube, and TikTok. It offers a complete, versatile, and simple-to-use solution for recording dialogue, interviews, and speech directly to a mirrorless/DSLR camera or a mobile device with a 3.5mm input.
 
The WAir-G2-A1 consists of a single tiny, lightweight clip-on transmitter with its own built-in microphone along with a separate lavalier mic that can be used if you prefer a more discreet mic setup. A mute button allows the talent to mute the transmitter quickly and easily. The system also includes a compact receiver that mounts on your camera or mobile device and plugs into its 3.5mm input jack. Built-in DSP processing helps eliminate noise and keeps latency down to 12.5ms for improved audio/video sync.
 
The system delivers reliable transmission with clear sound at a line-of-sight distance up to 230' (131' with limited obstacles). The built-in rechargeable batteries provide up to 8 hours of operation and recharge in 1.5 hours via USB Type-C ports. A two-in-one charging cable is provided.
 
Color TFT displays on the transmitter and receiver show important information, including battery power, mute status, low-cut filter status, and more. Both 3.5mm TRS cable for camera use and a 3.5mm TRRS cable for smartpone use are included.
 
Single-Channel Receiver with Belt Slip

• The Receiver features a belt clip, which also doubles as a shoemount adapter for your camera.

Clip-On Transmitter with Built-In Mic and Lavalier Mic

•  The compact transmitter is equipped with both a built-in microphone and a 3.5mm input that accepts its included lavalier microphone.
•  The transmitter can be clipped on clothing without having to wire yourself or your talent, providing a fast, truly wireless setup. You can also hold the transmitter in your hand and use it as a handheld microphone.
•  A low-cut filter on the transmitter can be engaged to reduce air-conditioning and wind noise.

Easy-to-Operate System

•  The receiver features a belt clip, which also doubles as a shoe mount adapter for your camera.
•  The transmitter and receiver pair automatically for a fast wireless setup.
•  Settings on the receiver allow for gain adjustment for the microphone.
•  The receiver and the transmitter have TFT displays that indicate power, battery life, mute, and gain status.
•  The transmitter and the receiver are powered for up to 8 hours via built-in lithium-ion rechargeable batteries.
•  The battery rechares in 1.5 hours; a charging cable is included.