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.
Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($167.85): BGGAL8
2. ($167.85): BGRCParts8
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): bGhOnEy10, BGHALLOWEEN, BGTX18SYTB, BGTX18SLYB, BG11PP12, BG18SLNV, BG18SYB, 7d18f7, 7bcdf9, BG18SL, Parts8, BG18SLNE, BGRRCB10, BGRadio18, BGRCRR9, BGCuponation10, BG18MR, BGDAVIS, BG18slite, BG28b856, BG431fea, BG01ba22, BG01BA22, BG71453a, BG70e5fc
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – RadioKing TX18S Lite RC Transmitter ($-3)
2. Europe – RadioKing TX18S RC Transmitter [EU] ($-3)
Price history and price alert
Check out price history chart (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)).