Aliexpress
Click here… to search for Radiolink T8S FHSS RC Transmitter R8EF on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (70.12 USD): Parts8
(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): 2019SPEDM, bgssaff9, BGCITYADS2019, BGRLT8S, BGT8S15, BGRKT8S, BGVDay10%off, BGRDT8S, 7d18f7, BGTT10, bGhOnEy10, bgshOOp10, BGRCRR9, BGCuponation10, BGDAVIS, BGradio9, BG70e5fc
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Radiolink T8S FHSS RC Transmitter R8EF.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).