Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Bottom Plate Thickness: 3.5mm, Model: Protek35 Analog, Weight: 305±10g, Upper Plate Thickness: 2mm, Wheelbase: 151mm, Item Name: 3.5 Inch 151mm F4 6S Whoop FPV Racing Drone, Size: 118*91mm, Brand: iFlight,
Aliexpress
There’re some similar (or not) items on Aliexpress
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. ($286.19): BG8d2ac7
2. ($292.55): BGGAL8
3. ($292.55): BGJON8
put item in your cart and apply coupon code there 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): BGfa7ab5, Drones6, BANGGOODSD, CouponsDE, 00c906
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for iFlight Protek35 Analog 3.5 Inch 6S Drone is here.
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)).