Mini W5100 LAN Ethernet Shield Network Board Module Ethernet UNO Mega 2560 3.3V Geekcreit for Arduino - products that work with official Arduino boards
ETHERNET SHIELD W5100
Amazon.com: DEVMO W5100 Ethernet Network Shield LAN for Ar-duino Expansion Board Module with SD Card Slot Compatible with Ar-duino UNO MEGA2560 UNO R3 ATMega 328 MEGA 1280 : Electronics