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Here are coupons that you can use.
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – RadioKing TX18S Lite RC Transmitter (-3 USD)
2. Europe – RadioKing TX18S RC Transmitter [EU] (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (167.85 USD): BGGAL8
Coupon (167.85 USD): BGRCParts8
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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
(system checks these coupons on every price check (like once per 24 hours), 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 USD)
2. Europe – RadioKing TX18S RC Transmitter [EU] (-3 USD)
Price history and price alert
Check out price history chart (for all/most countries) for RadioKing TX18S RC Transmitter.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).