I am addicted to AliExpress. They have a lot of Zigbee stuff at great prices.
Quite often you will find these for cheap in their ‘$1.99’ deal section. You have to buy at least 3 things from this section to get free shipping, which is guaranteed 12 days. Most shipments arrive a day or two before they were supposed to arrive. You can only buy one of each, so if you want more, you have to start a new order.
I found Tuya water leak sensors for $1.99 so now there are redundant sensors at every possible leak point.
This sensor is not on sale presently.
Tuya Zigbee PIR motion sensor $2.99
Tuya Zigbee door/window contact sensor $2.99
Found this Zigbee RGBW bulb for $1.99 when it is on sale.
Regular price is about $6.50
The bulb is marked Ewelink. Says it will interface with Philips Hue.
After trying every Generic Zigbee and Advanced ZigBee RGBW driver, the ‘Generic Zigbee RGBW Light driver is the one to use. The others either couldn’t keep the bulb off, or changed colors arbitrarily.
Here is the link to their sale listing. You have been warned.