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Modified Version One Set Uno R3 Ch340g+mega328p Chip 16mhz For Arduino Uno R3 Development Board + Usb Cable - Integrated Circuits - AliExpress
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10pcs UNO R3 CH340G+MEGA328P SMD/DIP Chip 16Mhz For Arduino Development Board USB CABLE ATEGA328P - AliExpress
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Amazon.com: CANADUINO 2 x Atmega328P-PU Replacement Chip for Arduino UNO R3 - Bootloader : Electronics
Adafruit AVR Sticker for Breadboard Arduino-compatibles - 10 pcs : ID 554 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Arduino UNO R3 Development Board ATMEGA328P Chip CH340G with cable (Clone) - hit.ps