$55.99 – Supply Voltage: 5V DC (from USB or JST-GH), Transmit Current: 100 mA at 20dBm, Serial Interface: 3.3 V UART, Receive Current: 25 mA.
When I was updating this page the price was $55.99 for Holybro SiK Telemetry RC Radio V3 100mW 433MHz / 915MHz (in Banggood). Just check coupons out (with price alert and history). What is the best price?
Latest coupon and price update (UTC):
Banggood ($55.99)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Isn’t it too expensive? This is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: $55.99
Additional Banggood coupons: first page and second page
This is the best price ever noted in my database!
Old coupons (from the oldest to the newest): BGSiKV3, BGRCParts8, BG1efeb0, MVC8SPRING, 8BGwbg2204, Cuponation9, BGMatt2022, BGToys8, BGGutscheine, BG8OFFCOUPON, TTBLACK5, JanBGCoupon8, BGSaleFeb8, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Holybro SiK Telemetry RC Radio V3 100mW 433MHz / 915MHz. The lowest price was: $55.99.
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)).