Voltage: DC7-8 4V, Weight: 1.1kg (without battery), 2×21700 or 2s lipo, Size: 180 * 190 ” 58mm, Battery: 2×18650 (tray supplied), External Micro SD Card: 1G, Item Name: TX18S/Lite Transmitter, Channel: 16ch.
Basically copy coupon, view price history or create e-mail price alert. What is best price?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($167.85): BGGAL8
2. ($167.85): BGRCParts8
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): bGhOnEy10, BGHALLOWEEN, BGTX18SYTB, BGTX18SLYB, BG11PP12, BG18SLNV, BG18SYB, 7d18f7, 7bcdf9, BG18SL, Parts8, BG18SLNE, BGRRCB10, BGRadio18, BGRCRR9, BGCuponation10, BG18MR, BGDAVIS, BG18slite, BG28b856, BG431fea, BG01ba22, BG01BA22, BG71453a, BG70e5fc
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – RadioKing TX18S Lite RC Transmitter ($-3)
2. Europe – RadioKing TX18S RC Transmitter [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for RadioKing TX18S RC Transmitter. The lowest price was: $98.99.
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)).