Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (95.53 USD): Drones6
(CouponsFromChina.com tip: just apply this code 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): BGZETA, AFfbG10, BGAIRP12, 502C6B, BGOTC20, BGBFAFF2019, BGCITYADS2019, BG9c6807, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7, BANGGOODSD
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Zeta Ultra-Z Blaze RC Airplane KIT.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).