BetaFPV X-Knight 35 4S Polar 155mm Drone (Banggood, Aliexpress: Power Connection: XT30 / black&red wires, Item: X-Knight 35 FPV Quadcopter, Motor: 1404 3800KV Brushless Motors, FC&ESC: F4 AIO 20A Brushless Flight Controller V3, Weight: 142.9g (Without battery), Recommended Battery: 750mAh 4S 95C Lipo Battery (Not Included), Props: HQ 3520 3-Blade Propellers (Gray) / Gemfan 3520 3-Blade Propellers (Gray) (the best price with coupon)).
Just check coupons out (with price alert and history). 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($286.99): BGbe3547
2. ($373.09): Cuponation9
3. ($373.09): BgGoodie9
4. ($377.19): BGJON8
5. ($377.19): BG8ReviTrage
just apply this code in your 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/feV
Old coupons (from the oldest to the newest): BG62eb59, Drones6, BANGGOODSD, CouponsDE, 00c906, Tabby20, CouponsdeFPV, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, BG5b2913, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGJUNEGSG9, BG874251, COUPONSDE1wk
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for BetaFPV X-Knight 35 4S Polar 155mm Drone. The lowest price was: $286.99.
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)).