Both Murata and Inventek produce pre-certified turn-key 802.11 b/g/n Wi-Fi modules based on Broadcom's BCM43362 and WICED SDK:
The eS-WiFi series is available with an integrated microstrip antenna, but is also offered in a U suffix version with an external antenna using a built-in U.FL connector on the module.
SN8200 (FCC/IC/CE Compliant)
http://www.murata-ws.com/products/spec_sheet.php?type=SN820X 2.4GHz Wi-Fi 802.11b/g/n&record=12
The SN8200 also provides an on-board antenna and is also available with a U.FL connector for use with external antenna.
Both products utilize ST Micro STM32 based Cortex-M3 MCUs.
Follow the "Get a Kit" link on the website to see a list of our distribution partners in your area as they will be able to help with price/avaialibity for both modules
It looks like Avnet has the 88-00151-00 SN8200 module in stock online: