Amazon.com: SIM808 Module GSM GPRS GPS Development Board IPX SMA with GPS Antenna Raspberry Pi Support 2G 3G 4G SIM Card : Electronics
SIM808 GPRS/GSM+GPS Shield v1.1 - Elecrow
SIM808 GSM/GPRS/GPS UART MODEM
diymore SIM808 Module GSM GPRS GPS Development Board with IPX SMA GSM GPS Antenna Support 2G Network for Arduino Raspberry Pi|Integrated Circuits| - AliExpress
SIM808 GSM/GPRS/GPS UART MINI MODEM
SIM808 instead of SIM908 module GSM GPRS GPS Development Board IPX SMA with GPS Antenna available for Raspberry Pi| | - AliExpress
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Basics: Project 053d SIM808 GSM GPRS GPS Bluetooth evolution board (EVB-V3.2) at Acoptex.com / ACOPTEX.COM