Just check coupons out (with price alert and history). Best price?
Suitable for FrSky taranis X-lite transmitter, Weight: 19g, Maximum power: 10W, Gain: 5+-1dBi, Brandwidth: 2.35-2.55GHZ, Standing wave ratio: ≤1.5, Connector: RP-SMA male, Impedance: 50 ohms
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
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LANTIAN 2.4G 2.4GHZ T-style Extended Range WiFi 5db Antenna RP-SMA Male for RC Drone Frsky Taranis X-lite transmitter radio | $9.82 | – |
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. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($12.74): Parts8
you should apply the coupon in your 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): 2020CNY, BGVDay10%off, BGTT10, bGhOnEy10, BGSS10%SW, BGRCRR9, BGRC902, BG11SHOP, BGDAVIS, 13f142, BGradio9
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for LANTIAN 2.4G T-Style RC Antenna for Frsky Taranis X-lite 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)).