2pcs STM32F103C8T6 ARM STM32 Minimum System Development Board Module STM32F103C8T6 Core Learning Board for Arduino Price$20.99 Price checked yesterday at Crazy Sales
UNO R3 ATmega328P microcontroller CH340G Improved Version Development Board Compatible with Arduino IDE with USB Cable and 2.54mm Straight Pin Header Price$15.99 Price checked yesterday at Crazy Sales