Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (483.59 USD): aff7off
(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): TTxBG10, bgssaff9
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for DJI Spark Fly More Combo Refurbished Drone is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).