ATM you can buy HD 1080p for 389.99 USD (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (389.99 USD)
Banggood warehouse is located in Hong Kong. What about the price? Pretty good price – average (447.78 USD) is higher than current one! Only one coupon available!
Link: Banggood product page
Price without coupon: 409.99 USD
Coupon (389.99 USD): BGaad335
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
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): 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BG0fbd0b, Cuponation9, COUPONSDE1wk, BgGoodie9, BGMatt2022, BGToys8, BGGutscheine, TTBLACK5, BG5e35eb, BGfcf1a8, BGd88479
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
Click here… to search for Fat Shark Dominator Digital HD 1080p OLED FPV Goggles HDO3 on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Fat Shark Dominator Digital HD 1080p OLED FPV Goggles HDO3.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).