Price history, coupons and price alert are available on this page. Best price?
Power Switable: 25mW/200mW/600mW/1000mW, Connector: MMCX, Power Input: 7V-26V, Extra features: 1W Smart audio, Power Output: 5V
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): mijia799, b00373, 502C6B, 369d39, f62884, BGTX1200, Parts8, BGBCFPV, BGEach10, BGBCBG10, BGEachine10, 2020CNY, bGpAnDacHeCk, BGVDay10%off, BGOTC21, bGhOnEy10, BGAFF7OFF, bgshOOp10, BGRC902, BGTT10, 13f142, BGEachine2021, BGCuponation10, BGRCEachine, Tabby20, BGRCT10, BGToys8, BGMatt2022, BG589b2e, BGCZVIP0517, BGCZVIP05172, BGedc35e
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Eachine TX1200 25/200/600/1000mW FPV Transmitter [EU/UK] ($32.99)
Price history and price alert
Here is price history (for all/most countries) for Eachine TX1200 25/200/600/1000mW FPV Transmitter.
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)).