Item name: XJB F440 Omnibus F4 Flight Controller & 40A Blheli_32 40A ESC, Weight: 8.9g, Usage: for 65mm-250mm Frame Kit, Brand name: HGLRC.
Just check coupons out (with price alert and history). You probably want to know what is the best price?
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. ($48.19): BGAFF10OFF
2. ($48.19): BGTT10
3. ($48.19): bGhOnEy10
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/i1u
Old coupons (from the oldest to the newest): AFfbG10, BGVDay10%off
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for HGLRC XJB F440 Omnibus F4 Flight Controller 40A 3-4S ESC? There we go. The lowest price was: $44.99.
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)).