Arduino Zwave shield

We need an arduino shield that can communicate with z-wave. The following example: [login to view URL] Does not speak zwave protocol. We need to communicate with the z-wave devices in the home-centers, for example: http://www.amazon.com/GE-45604-Technology-Outdoor-Lighting/dp/B0013V8K3O/ref=sr_1_1?ie=UTF8&qid=1363603294&sr=8-1&keywords=45604 This is one-way communication of simple on-off commands. Please do not exceed the max price. You will be responsible for all materials you need for prototyping the board and testing the device. You will deliver a working prototype with PCB designs, schematics, and software. You must be able to control the 45604.