Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (51.12 USD): BGHONEY2110
Coupon (52.26 USD): BGDAVIS
(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): BG10HP007, TTxBG10, KevinCAR, AFfbG10, BGRCPART, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BG10PARTS, 7d18f7, BGAFF10OFF, bGhOnEy10, BGUBHP007, BGdragonBoat, bgshOOp10, BGRC902, BgoFErTaSchInA10, BGHALLOWEEN, BgcLuBofErtA10, BGCuponation10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Hobby Porter HP007 RC Transmitter is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).