Basically copy coupon, view price history or create e-mail price alert. Best price?
TOP RC HOBBY 402mm Mini P47 2.4G 4CH 6-Axis Gyro One Key Aerobatics U-Turn EPP Scaled Warbird RC Airplane RTF for Beginners Compatible OpenTX Transmitter – Red
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 and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now. You can get coupon down below.
Link: Banggood product page
1. ($79.19): BGPlane12
apply code in your basket (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/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $49.99.
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)).