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I concur about the WIFI module price, it would have cost you double that not so long ago. There are Lantronix, SimpleLan and others that have bare bones modules in that same range. The MRF24J40MA Zigbee/MiWi module is a cheaper wireless alternative at $10 (i.e if you want to mess with the software to run it).
The datasheet, example code, driver integrated into Microchip TCPIP stack, and other collateral is available from the ZeroG website. ZeroG registration is a simple name, company, email, questionaire. Individual docs are kept up to date at the ZeroG site.
Note, that most of the information is also available by downloading the Microchip TCPIP stack v5.00 from Microchip.