You can create price alert here, copy coupons and view price history. What is the best price?
SRD Radio (HackRF only), Shell, Portapack H2
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($216.19): BG00c906
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG34H, BG34H2, BG129H2, BgcLuBofErtA10, BG134h, BGCuponation10, BGhack149, BGHONEY2110, 7bcdf9, BGa64786, 00c906, BGe0f156, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 2.4 Inch PortaPack H2 HackRF One SDR Metal Shell Kit [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for 2.4 Inch PortaPack H2 HackRF One SDR Metal Shell Kit.
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)).