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 (8.09 USD): BGAFF10OFF
Coupon (8.09 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: apply it 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): BGSS10%SW, BgoFErTaSchInA10
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf BW-TC20 1.8m 3A Magnetic Cable Type-C.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).