Adafruit 0.56 4-Digit 7-Segment Display w/I2C Backpack - Yellow : ID 879 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Stemedu 5PCS 8-Digit 7 Segment MAX7219 Digital Segment Module, Seven Section 8 Bit LED Display Tube for Ar-duino MCU/51/AVR/STM32 for Raspberry Pi ESP8266 Nodemcu : Industrial & Scientific
7-SEG RGB click - full color 7 segment display | MikroElektronika