Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (36.47 USD): BGTT10
Coupon (36.47 USD): bGhOnEy10
Coupon (37.28 USD): Parts8
(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): BGChollodrones953, BGNano4, BGfox15, BGBCBG10, BGNano1, BGFOX12, 502C6B, BGOTC21, BGBFCR13, BGCITYADS2019, BGNanoE, 2020CNY, BGVDay10%off, BGFOXCAM, BGFoxeer100, BGFPP
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Foxeer Nano Predator 4 FPV Camera Pad Version.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).