Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Charging Time: About 3.5h, Motor: 3700KV Brushless Motor, Main Blades: Glass Fiber, Battery: 11.1V 2200mAh 25C Battery, Item Weight: About 0.974kg, Gyrocope System: Bigaole 3 Axis Gyro, Package Weight: About 2.5kg, Servo: 3x EMAX ES08MD Servo and 1x EMAX 9257 Lock Tail Servo, Length: 660mm, Control Distance: About 1000m, Main Frame: Carbon Fiber, Width: 110mm, ESC: HobbyWing 50A Brushless ESC, Package Size: 720*150*340mm, Rotor Diameter: 325mm, Height: 200mm, Flying time: About 15min
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. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGXFX20, TTxBG10, bgssaff9, AFfbG10, BGBSP30, BGBBS30
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for XFX 450 DFC RC Helicopter.
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)).