$30.35 – CH 1-CH 4: Connects the servos / power supply, other components, Online Update: Yes, BIND: For bind cable, Model Type: Car/Boat, Data Output: PWM/i-BUS/PPM, Channels: 4, Antenna: Built-in Antenna, i-BUS: for channel expansion, Frequency Range: 2.402-2.480GHZ, Transmission Power: <20dBm(EU), Input Power: 3.5V 8.4V, Certification: CE / FCC ID: N4ZFGRS400, RF Standard: AFHDS3, Display: LED Indicato.
You can get Flysky FGr4S V2 RC Receiver for $30.35 using coupon code (in Banggood). Check coupons or create price alert down below. Best price?
Latest coupon code price check (UTC time):
Banggood ($30.35)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it good price? According to my database, the average price is $31.59 and current price is $30.35, so it’s probably a good price!
Link: Banggood product page
Price: $30.35
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): Parts8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BGRADIORU, BGToys8, BGMatt2022
(there’s a little possibility that old coupon will work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Flysky FGr4S V2 RC Receiver. The lowest price was: $27.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).