FS2A 4CH AFHDS 2A Receiver (Banggood, Aliexpress: 2.4G mode: AFHDS 2A, Failfe: Yes, Band width: 135, Frequency range: 2.408-2.475GHZ, Weight: 0.9 grams, Working current: 20MA, Output signal: PWM, Distance: 400+ meters, Channels: 4CH, Dimensions: 11 * 25MM, Receiver sensitivity: -92DBM, Supply voltage: 3.3-10V (the best price with coupon)).
Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($15.93): BGGAL8
2. ($15.93): BGRCParts8
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): FS2A, 20OFFRSF, Parts8, BGaDmITAd, BGCITYADS2019, 2020CNY, BGVDay10%off, BGFS12, BGFKY11, bGhOnEy10, BGTT10, BGflysky11, BGRCRR9, BG11SHOP, 13f142, BGCuponation10, BGDAVIS, BG70e5fc
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for FS2A 4CH AFHDS 2A Receiver? There we go. The lowest price was: $5.7.
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)).