im interested in arduino and zwave projects, but since i'm not an expert (not even close) and after some research and i found this and i wonder if its of any use for arduino...http://media.digikey.com/pdf/Data%20Sheets/Zensys%20PDFs/ZM3102N.pdf
this is the datasheet for the ZM3102N Z-Wave Module based on the ZW0301 Z-Wave Single Chip.
i believe that the chip can be purchased for less than 4,50$ each. http://www.z-wavealliance.org/modules/iaCM-ZW-PR/readMore.php?id=28311552
"...The ZM3102 will cost less than $4.50 in volume.[DWF1] ..."
maybe the more expert people can tell if this is good intel or not... anyway, just trying to help