Also available on ebay for $44 delivered with SAFY20 or $43 with PLUSFY22 here.
At roughly $11 an item, I think it's a good deal.
Includes 1. hub, 2. door/window sensor, 3. temp/humidity sensor and 4. a switch.
Looks like a great starter pack. Hub is Zigbee 2 and 3, 2.4Ghz Wifi and Bluetooth. I've made a Xiaomi temp sensor work with an Aliexpress hub without any problems. And the Xiaomi sensor I have seems to be of sound quality.
With a couple of bulbs and maybe an IR hub, there's lots you can do with this.
Are these global version or China mainland only?