Wireless Sensors Kit

Hello Every body,
I would like to build up a mesh-type wirelss sensors network with 3-4 nodes for acquiring temperature, humidity and solar light incidence.
The nodes, better with ZigBee protocol, should have a distance range of 30-40 meters.
Does anybody know some cheap demonstrative kit for such purpose?
Thank you so much in advance.
Cordially,
Frank.

Sparkfun sells inexpensive zigbee kits, you'd be on your own for the temp/humidity/light sensors though and a micro controller.

Thanks

Hi, thank you so much !! I'll check sparkfun website.
Frank