Get coupons, create price alert or check price history out! What is the best price?
USB Adaptor Current: >2.0A, Brand: FrSky, Charging Current: ≤1A ±200mA, , Operating System: ETHOS, Dimension: 200*192*95mm (L*W*H), USB Adaptor Voltage: 5V+0.2V, Compatibility: ACCST D16 & ACCESS & TD receivers, Operating Temperature: -10°C~60°C (14°F~140°F), Internal RF Module: TD-ISRM, Weight: 687g (Battery Excl.) / 820g (Battery Incl.), Module: Tandem X18S, Operating Current: 240mA@7.4V (typ.), Operating Voltage Range: 6.5 ~ 8.4V (2S Li-battery), Number of Channels: Up to 24 channels, Backlit touchable LCD resolution: 480*320, Built-in 512MB Flash Drive Storage
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($496.79): BGRADIORU
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRCT10, BGJUNEGSG9
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for FrSky TANDEM X18S RC Transmitter is here.
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)).