Basically copy coupon, view price history or create e-mail price alert. What is best price?
BEC output: 5V 2.5A, Barometer: DPS310, Vista digital system Plug-and-Play (VBAT passthrough), MCU: BGA-STM32F745 / 216MHz, Blackbox: 16MB Onboard Flash, OSD: AT7456E, Gyro: MPU6000
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.
Link: Banggood product page
1. ($148.11): BGJON8
2. ($148.11): BGRCParts8
3. ($148.11): BGToys8
4. ($148.11): BG8OFFCOUPON
coupon code has to be applied in shop’s 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): Parts8, BGGAL8, BGAlerabat1, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BgGoodie9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for 25.5×25.5mm iFlight Beast V2 AIO F7 Flight Controller 55A.
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)).