Can use ZHA in Home Assistant or use Zigbe2MQTT, SMA interface external antenna, 20dBm output gain, Base on TI CC2652P CP2102N, Pre-flashed with Z-Stack 3.x.0 coordinator firmware, Optional 1.5m USB extension cable for better signal range, Aluminum housing effectively reduces signa1 interference from peripherals.
Check coupons or create price alert down below. Let’s see what best price is ATM.
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.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Cuponation9, BG8ReviTrage
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for SONOFF Zigbee 3.0 USB Dongle E ZB USB With Antenna Gateway Analyzer. The lowest price was: $18.68.
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)).