Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (221.39 USD): BGEachine10
(CouponsFromChina.com tip: apply it 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): BGEALAL, AFfbG10, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGLAL51, BGJPELGR40, BGdragonBoat, BGSS10%SW, BGLAL4K, Eachine11, bgshOOp10, BGRC902, BgcLuBofErtA10, BG11EACHINE, BGEachine2021, BG10RACING
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Eachine LAL5.1 225mm Drone PNP is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).