Get coupons, create price alert or check price history out! Do you want to know what the best price is?
Telemetry Interface: Smart Port, External Power Supply: 6V~13V, Compatibility: R9 Series Receivers, Modulations: PXX or CPPM (auto-detected), Vin Voltage Range: 6V-13V, Item Name: R9M 2019 900MHz Transmitter Module, Upgrade Interface: Smart Port
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($67.97): BGDAVIS
this code has to be applied 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): 7d18f7, BGMD10, Parts8, BGR9MSWK, Email5, BGVDay10%off, BGR9MS, BGFrskyFB, BGTT10, bGhOnEy10
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Frsky R9M 2019 900MHz Long Range RC Transmitter R9 Slim+.
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)).