Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Hi-Speed USB 2.0, USB-powered, Software-controlled antenna port power (50 mA at 3.3 V), SMA female clock input and output for synchronization, Half-duplex transceiver, 1MHz to 6 GHz operating frequency, Convenient buttons for programming, Open-source hardware, Compatible with GNU Radio / SDR# / and more, Software-configurable RX and TX gain and baseband filter, SMA female antenna connector, Up to 20 million samples per second, Internal pin headers for expansion, 8-bit quadrature samples (8-bit I and 8-bit Q)
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($211.35): BG00c906
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 7bcdf9, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for HackRF One 1MHz to 6GHz Radio Platform Development Board.
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)).