According to my DB the lowest price is 305.99 USD for Fat Shark Recon HD 4 Inch 1920×1080 FPV Goggles (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (305.99 USD)
Banggood warehouse is located in Hong Kong. There are no coupons available at this moment in Banggood. Is it a reasonable price for this item? From what I can see this price is higher than average price (292.66 USD).
Link: Banggood product page
Price: 305.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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:
Old coupons (from the oldest to the newest): BGBFDAY8, BGHONEYSP
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Fat Shark Recon HD 4 Inch 1920×1080 FPV Goggles.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).