According to my DB the lowest price is $161.99 for Portable Radio Transceiver 3.2 inch Touch Screen HackRF One V1.7.3 with Portapack H2 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Portable Radio Transceiver 3.2 inch Touch Screen HackRF One V1.7.3 + Portapack H2 Built-in 2000mAh Battery Kit – Silver
Latest coupon code price check (UTC time):
Banggood ($161.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Good or bad price? Well, according to CouponsFromChina database this price is the best in history (3 records).
Link: Banggood product page
Price: $161.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGSPRING8OFF, BGHONEYSP, BGESJY8, BGALL8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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 Portable Radio Transceiver 3.2 inch Touch Screen HackRF One V1.7.3 with Portapack H2.
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)).