LAFVIN Mega 2560 R3 ATmega2560-16AU Board +USB Cable Compatible with Arduino IDE Price: $13.99 (as of 23/11/2020 03:35 PST- Details)

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The mega 2560 R3 Board is 100% Compatible with Arduino IDE.
The Uno uses an ATmega2560-16AU instead of the Atmega16U2 chip now. Faster transfer rates and more memory.