I have checked all old coupons and price is 128.79 USD for 5-10W USDX (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest price update (UTC time):
Banggood (128.79 USD)
Banggood warehouse is located in China. But wait a sec… Is it a good price? Let’s see… Average price for this item is 134.74 USD and current one is 128.79 USD, so it’s a good price! Nice, I’ve got 2 active coupon codes for you!
Link: Banggood product page
Price without coupon: 139.99 USD
Coupon (128.79 USD): BGSPRING8OFF
Coupon (128.79 USD): BGHONEYSP
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG49ddd3, BG9285df, BGMARCHSALE, BG20236Tool, BGTOOS729, BG8FORMULAMX, BGBFDAY8, BGNEWYEAR8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for 5-10W USDX USDR HF QRP SDR Transceiver SSB/CW on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 5-10W USDX USDR HF QRP SDR Transceiver SSB/CW.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).