Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Burst Current: 45A (10S), Con. Current: 40A, Input Voltage: Support 2-6S Lipo, CPU: STM32F722RET6, 40A BLheli_32 2-6S 4in1 Brushless ESC, Mounting Hole: 30.5×30.5mm (M4), Support DShot1200 In default, Model: StarF7, Item Name: F7 OSD Flight Controller AIO 40A 4in1 ESC Board, Input Voltage: 2-6S Lipo, Size: 51x43mm, Brand Name: Racerstar, ICM-MPU6000 Accelerometers and Gyroscopes SPI, Output Voltage: 5V@2A, F7+OSD+BEC+CURRENT+DJI+BLACK BOX (DUAL CAMERA), – MicroUSB Socket, SBEC: 9V 3A, Programming: YES, Weight: 20g
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. ($66.59): BGHONEY2110
2. ($68.07): BGDAVIS
paste coupon code in your cart and click Apply 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): BGAFF10OFF, BG30RSFC, BGCuponation10, BG50StarF7, BGCLF72
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for 30.5×30.5mm Racerstar StarF7 F7 Flight Controller AIO 40A.
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)).