Aliexpress
Click here… to search for BlitzWolf AirAux AA-UM12 Bluetooth V5.1 Earphones on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (17.99 USD): BGd633ee
Coupon (17.99 USD): BG135a12
Coupon (18.99 USD): BGUM12Y
Coupon (27.48 USD): BGAlerabatKL
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGUM12, BGUM12D, BG56de6b, BGd6e782, BGHUN121, BGHU1116, BGBuscape01, BGUM122, BG10e132, BGaeaf96, BGHOTSHOP15, BG53e9c8, BG065914
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for BlitzWolf AirAux AA-UM12 Bluetooth V5.1 Earphones is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).