Just check coupons out (with price alert and history). Best price?
SucceX-E F4 45A Flight Stack, Body Size: 170*170mm, FPV Cam Spacing: 19mm, FC Mounting Hole: 30.5*30.5/20*20 mm, Propeller Size: 5 inch /5.1 inch, Item name: Nazgul5 HD 4S 5 Inch FPV Racing Drone, Brand name: iFlight, Wheelbase: 240mm, Weight: 400.8g (without battery), XING-E 2207 FPV Motor (4S 2750KV)
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.
Link: Banggood product page
1. ($413.09): CouponsdeFPV
2. ($422.27): BGGAL8
3. ($422.27): BGJON8
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/5cd
Old coupons (from the oldest to the newest): BG12NG5HD, bgshOOp10, bGhOnEy10, BGRC902, BgoFErTaSchInA10, BG15NG5HD, BgcLuBofErtA10, BG11Racer, BG11NG5HD, BGBFNG5HD, BGXSNGHD, BG10RACING, BG9MCH, BGDAVIS, BGMATT7, Drones6, BANGGOODSD, BG9ee2ef, BGcbea4d, CouponsDE, 00c906, Tabby20
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for iFlight NAZGUL5 HD 4S Drone BNF.
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)).