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.
Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
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. ($66.59): BGHONEY2110
2. ($68.07): BGDAVIS
apply code in your basket (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): BGAFF10OFF, BG30RSFC, BGCuponation10, BG50StarF7, BGCLF72
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for 30.5×30.5mm Racerstar StarF7 F7 Flight Controller AIO 40A? There we go. The lowest price was: $34.99.
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)).