$12.99 – High Impedance Amplifier for SDR (Banggood, Aliexpress: High Impedance Amplifier for SDR Walkie Talkie Small Loop Antenna HackRF One Donut Antenna – Black (the best price with coupon)).
When I was updating this page, then coupon price was $12.99 for High Impedance Amplifier for SDR (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
Latest coupon and price update (UTC):
Banggood ($12.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Well, is it a good price anyway? This is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: $12.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for High Impedance Amplifier for SDR. The lowest price was: $12.99.
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)).