Amazon.com: Pro Mini Atmega168 Mini ATMEGA168 Crystal Oscillator Board Module 16M 5V for Arduino Nano Replace Atmega328 : Electronics
Amazon.com: ELEGOO Nano Board CH 340/ATmega+328P Without USB Cable, Compatible with Arduino Nano V3.0 (Nano x 3 Without Cable) : Electronics
Arduino Nano [A000005]
Amazon.com: Arduino Pro Mini 328 - 3.3V/8MHz : Electronics
Amazon.com: Arduino Pro Mini 328 - 3.3V/8MHz : Electronics
Amazon.com: SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - Compatible with Arduino development board 5V/16MHz microcontroller AP2112 3.3V Voltage Regulator Castellated PTH pin pads Reset button Maximum 6V input : Electronics
HiLetgo 3pcs Pro Micro Atmega32U4 5V 16MHz Bootloadered IDE Micro USB Pro Micro Development Board Microcontroller Compatible to Arduino Pro Micro Serial Connection with Pin Header
Amazon.com: Arduino Pro Mini 328 - 3.3V/8MHz : Electronics
SparkFun Pro Mini ATmega328-5V/16MHz Development Board Compatible with Arduino Boards and IDE
ACEIRMC Pro Micro for Atmega32U4 5V 16MHz Bootloadered IDE Micro USB Pro Micro Development Board Microcontroller
Amazon.com: ELEGOO Nano Board CH 340/ATmega+328P Without USB Cable, Compatible with Arduino Nano V3.0 (Nano x 3 Without Cable) : Electronics
SparkFun Pro Mini ATmega328-3.3V/8MHz Development Board Compatible with Arduino Boards and IDE
Amazon.com: KNACRO I/O Expansion Sensor Shield Module for Arduino UNO R3 Nano V3.0/Nano Pro : Electronics
HiLetgo 3pcs Pro Micro Atmega32U4 5V 16MHz Bootloadered IDE Micro USB Pro Micro Development Board Microcontroller Compatible to Arduino Pro Micro Serial Connection with Pin Header
Amazon.com: HiLetgo 3pcs Pro Mini Atmega328P 5V/16MHz Development Board Compatible with Arduino pro Mini : Electronics
Amazon.com: HiLetgo 3pcs Pro Mini Atmega328P 5V/16M Replace ATmega128 Pro Mini Atmega328 328P DC5V 16M for Arduino : Electronics
Amazon.com: HiLetgo 3pcs Pro Mini ATmega328P 3.3V 8M Module Board with Crystal Oscillator Compatible Arduino Pro Mini Replace ATmega128 : Electronics
Amazon.com: Arduino Pro Mini 328 - 3.3V/8MHz : Electronics