Quite some time ago I ordered a bunch of Wireless Rabbit development kits from Rabbit Semiconductor. These controllers support 802.11 b/g wireless, and I also purchased some RCM5700 modules, which is basically the Ethernet version of the same processor. The dev. kits cost approximately $140 and come with the processor, development interface board for programming and power as well as a prototyping board with all of the required headers, standoffs, cables, software/drivers, etc. Once you own one dev. kit, you can simply purchase individual processors for ~$69 each and swap them out on the programming board. They can be connected using a mini PCI-Express connector broken out to a 50 pin header for access to all ports/pins.

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