Aliexpress
Click here… to search for Flysky X6B i-BUS 2.4GHz 6CH RC Dual Antenna on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (17.47 USD): BGMatt2022
(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, rchobbies8, e2bcea, FSX6B, 502C6B, FLX6B, TTxBG10, BGX6B, Parts8, BGX6B849, 13f142, BGFKY11, bGhOnEy10, BGflysky11, bgshOOp10, BGRCRR9, BGCuponation10, BGDAVIS, BG70e5fc, BGGAL8, BGRCParts8, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGJUNEGSG9, BGRCT10, BGRADIORU, BGToys8
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Flysky X6B i-BUS 2.4GHz 6CH RC Dual Antenna? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).