You can get RadioMaster TX16S Mark II V4.0 4-IN-1 ELRS RC Controller for $239.19 using coupon code (in Banggood). Just check coupons out (with price alert and history). What is best price?
Module Firmware: Multiprotocol- Module (4IN1) -OR- ExpressLRS (ELRS), Size: 287x129x184mm, Display: 4.3-inch TFT full-colour touch display with a resolution of 480 * 272, Upgrade method: Supports USB-C online / SD card offline upgrade, Radio firmware: EdgeTX, Transmission frequency: 2.400GHz-2.480GHz, Transmitter module: Option 1: Internal 4-in-1 multi-protocol module (CC2500 CYRF6936 A7105 NRF2401)； Option 2: Internal ELRS (SX1280), Gimbal: V4.0 Hall, Version: 4-IN-1/ELRS, Transmitting power: Internal 4-in-1 multi-protocol module: Max 100mw (protocol dependent); Internal ELRS: Max 250mw (transmitting power is adjustable), Module Bay: JR compatible module bay, Color: Black, Gimbal: Option 1: V4.0 Hall sensor with Aluminium fascia; Option 2: AG01 CNC Hall sensor, Antenna gain: 2db (transmit power adjustable), Working voltage: 6.6-8.4v DC, Weight: 750g (without battery), Brand Name: RadioMaster, Item Name: TX16S Mark II Radio Controller, , Remote control distance: > 2km @ 22dbm, Channels: Up to 16 channels (depending on the receiver), Working current: 400mA
Latest coupon code price check (UTC time):
Banggood ($239.19)
Banggood warehouse is located in China. Is it cheap? From what I can see this price is higher than average price ($197.67). I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Price without coupon: $259.99
1. ($239.19): BGALL8
apply code in your basket (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): 8BGwbg2204, BGRCParts8, BG27ea1b, BG0b6007, tRaDetRaCKeR, 8wEbgaInS5, BG2412ee, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGJUNEGSG9, BGTX16SMark, BGRCT10, BGRADIORU, BGToys8, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGMatt2022, BGMARCHSALE, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BGBFDAY8, BGSPRING8OFF, BGHONEYSP, BG124578, BG15RC02
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
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 RadioMaster TX16S Mark II V4.0 4-IN-1 ELRS RC Controller.
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)).