Ethernet Shield for Arduino - W5500 Chipset : ID 2971 : $39.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: SunFounder Ethernet Shield W5100 Compatible with Arduino UNO R3 Mega 2560 1280 A057 : Electronics
Transparent Acrylic Case Enclosure for Arduino Uno R3 with Ethernet Shield - CrispConcept - Specialty Tech Store
Arduino Ethernet Shield (China) - RoboticX
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: 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