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
Amazon.com: Tolako Ethernet Shield W5100 R3 Network Module for Arduino UNO Mega Support PoE : Electronics
Shield Ethernet Shield W5100 R3 FOR UNO Mega 2560 1280 328 only W5100 Development board - AliExpress