Zigbee module price

I was thinking to make zigbee motion PIR and then started to calculate cost.
Are those zigbee module cheapest?

In transmitter side (outdoor motion sensor) there would be PIR sensor, arduino uno, wireless shield and zigbee xbee module. In receiver side there would be raspberry pi with the same zigbee module. Most probably I would be multiple PIR transmitters, but seems that zigbee modules are quite expensive.

Can I use this as a zigbee wireless shield?