Aliexpress
Click here… to search for BlitzWolf AirAux AA-UM7 Bluetooth 5.0 Earbuds on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (12.74 USD): BGAudio3
(CouponsFromChina.com tip: you should apply the coupon 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): BGAAUM7, BGAAUM7A, BGLOAC1, 13f142, BGUM7BRR, BG5e1f0a, BG266664, BGBuscape01, BG651551
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf AirAux AA-UM7 Bluetooth 5.0 Earbuds.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).