Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (161.91 USD): Parts8
Coupon (161.91 USD): BGDAVIS
Coupon (166.99 USD): 7bcdf9
(CouponsFromChina.com tip: apply code in your basket (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): bGhOnEy10, BGJPT18SP, BGJPT18BTS, BGT18AG, bgshOOp10, BGT18AS, BGT18ASYB, BGT18PDQ, BGRC902, BGHALLOWEEN, BGT18OT, BGRCRR9, BGCuponation10
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Jumper T18 RC Transmitter is here.
Price records source(s): Banggood
Click on image to enlarge.
You can set price alert (for Banggood).