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 (417.04 USD): BGAFF10OFF
Coupon (417.04 USD): BGdragonBoat
Coupon (417.04 USD): bGhOnEy10
Coupon (417.04 USD): bgshOOp10
Coupon (417.04 USD): BgcLuBofErtA10
(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): 6d902b, BgAuMotor, b71c67, 4cc617, BGinsta360ee, bgaumotor, BGBINKUPON985, BGAutos, BgoFErTaSchInA10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Insta360 EVO 5.7K Action Camera is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).