According to my DB the lowest price is 132.99 USD for 40CH FPV (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (132.99 USD)
Banggood warehouse is located in Hong Kong. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it a reasonable price for this item? Current price is the lowest in history (according to CouponsFromChina database)!
Link: Banggood product page
Price: 132.99 USD
132.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Click here… to search for Fat Shark ECHO 5.8G 40CH FPV Goggles on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Fat Shark ECHO 5.8G 40CH FPV Goggles.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).