Brand name: RJXHOBBY, Suitable for Frsky X-lite, Item name: transmitter stick ends.
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Aliexpress
There’re some similar (or not) items on Aliexpress
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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. ($19.74): BGRADIORU
2. ($20.18): BGRCParts8
put item in your cart and apply coupon code there 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): 502C6B, 13f142, 2020CNY, BGVDay10%off, BGMPB2020, bGhOnEy10, BGSS10%SW, bgshOOp10, BGRC902, Parts8, BGRCRR9, BGCuponation10, BGDAVIS, BGradio9, BG70e5fc, BGGAL8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGJUNEGSG9, BGRCT10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for RJXHOBBY M2.5 Transmitter RC Stick Ends X-Lite. The lowest price was: $8.77.
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)).