Discontinued - you can grab Adafruit Grand Central M4 Express featuring the SAMD51 instead!
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Arduino Mega 2560 ATmega2560 MCU Rev3 Best Price
mega2560 + wifi r3 atmega2560+esp8266 32mb
1 x Mega 2560 ATmega2560-16AU Board without USB Cable for Arduino, Product Size: 110 x 53 x 15 (mm), Input Voltage: 7-12V, 16 analog inputs.,
Arduino MEGA 2560 board
Arduino 2560 Mega R3 ports 49 to 52 - IDE 1.x - Arduino Forum
Arduino Mega 2560 Rev3 (Original)
Harnessing the ESP8266 in the Arduino Mega 2560+WiFi R3 - CodeProject
Arduino Mega 2560 Rev3 (Original)
Microcontroller: ATmega2560 Operating Voltage: 5V Input Voltage (recommended): 7-12V Input Voltage (limits): 6-20V Digital I/O Pins: 54 (of which 15
Arduino Mega 2560 ATmega2560
Arduino Mega 2560 R3 (Atmega2560 - assembled) - Mega!