Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (110.30 USD): Parts8
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): aff7off, AFfbG10, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, 7bcdf9, BGCuponation10, BGHONEY2110, BGDAVIS
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for HGLRC FD445 STACK OMNIBUS F4 RC V6 45A 2-6S.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).