I have just checked coupons. The lowest price I could get is 5.79 USD for 100W USB-A/USB-C to USB-C/iP Cable 2m (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (5.79 USD)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Is it cheap? It looks like it’s a good price (lower than average (5.96 USD)).
Link: Banggood product page
Price: 5.79 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 100W USB-A/USB-C to USB-C/iP Cable 2m.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).