, LED: Support, External Buzzer: Support, Current Monitoring: Support, OSD: BetaFlight OSD w/ AT7456E chip, Integrated LC Filter, BEC Output: 5V@1A, FC Firmware target: MATEKF411, USB Port: MicroUSB, , MCU: STM32F411, Betaflight OSD: Support, Baro: NO, IMU: MPU6000 gyro/accelerometer (SPI).
Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($36.85): bGhOnEy10
2. ($36.85): BGdragonBoat
3. ($36.85): BGAFF10OFF
4. ($36.85): BgcLuBofErtA10
you should apply the coupon in your cart 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): BGSS10%SW, bgshOOp10, BgoFErTaSchInA10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for 25.5×25.5mm AuroraRC F411 AIO F4 Flight Controller 30A. The lowest price was: $35.09.
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)).