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 (359.99 USD): BGCITYADS2019
Coupon (371.99 USD): od7off
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): iQOO6, affiliate6, aff7off, bgssaff9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for VIVO iQOO 6/128GB CN Blue.
Price records source(s): Banggood
Click on image to enlarge.
You can set price alert (for Banggood).