Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG01SL5V2, BG10RACING, BGAFF10OFF, BG9MCH, BGDAVIS, BGMATT7, Drones6, BANGGOODSD, CouponsDE, 00c906, BGJON8
(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 iFlight Cidora SL5 V2.1 HD 6S 50A Drone BNF is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).