SIM808 GSM + GPRS + GPS Cellular Module : ID 2637 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Ai-Thinker Cheap GPS GSM GPRS Module Wireless Transmission A9G Development Board with USB, View gps development board a multi-functional development board based on AI-Thinker's A9G GPRS/ GSM module, Ai-Thinker Product Details from
MD0407 - A9G GPS GSM GPRS Development Module
SIM808 GSM/GPRS/GPS Module With Antennas - Senith Electronics