Aliexpress
Click here… to search for RBR/C B6 2.4GHz 6CH RC Transmitter with B6A/B6B 160A ESC Battery Set [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Sorry, but there’s no price history in my database. One coupon is available. Cool!
Link: Banggood product page
Coupon (49.67 USD): BGMatt2022
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BG66fc61, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BGRADIORU, BG713a36, BGToys8, BG0a742d
(there’s a little possibility that old coupon will work)
Price history and price alert
It’s a new item in our database, so I can’t create price history chart. We have saved this price in database: 27.99 USD.
You can set price alert (for Banggood).