I have checked all old coupons and price is $609.99 for FX-4CR Radio SDR HF Transceiver (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon code price check (UTC time):
FX-4CR Radio SDR HF Transceiver with 1-20W Continuously Adjustable Power Range Support USB/LSB/CW/AM/FW Modes Short-wave FX4CR （Random Color）
Banggood ($609.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. What about the price? From what I can see this price is higher than average price ($603.59).
Link: Banggood product page
Price: $609.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGHONEYSP, BGd0dfdc, BGESJY8, BGALL8
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for FX-4CR Radio SDR HF Transceiver.
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)).