Microphone weight 7g, Battery capacity 80mAh, Charging port Type-C, Receiver size 45*27*7mm, Transmission Distance 8m barriery / 20m barriery free, Receiver weight 4g, Frequency 2.4GHz, Microphone size 62*23*28mm, Input voltage DC4.8-5.4V, Model A3.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Coupons for A3 Wireless Lavalier Microphone? Nope, there’re no coupons in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG9e8c46, BGea0e30, BGec560a, BGBuscape01, BGa30c81, BG0d5f4a, BG186720, BG6991e8, BGff5767, BGaaa2f8, BG7c1484, BGe7810f, BG762c38, BGa61ecc, BG0859d3, BGHOTSHOP15, BG4d34ad, BGAlerabatKL, BG5356e7, BG5895ed, BGf1dbe7, BG9cd6a1, BGa7cc8b, BGbaf940, BG66be8f, BGbae409, BGd173b4, BGAUDIO, BG9ba0e8, BG1b5830, BGAudio3, BGAudio9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for A3 Wireless Lavalier Microphone? There we go. The lowest price was: $9.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).