Quantity   Component name
1 × Raspberry Pi Zero W (although any network-connected Pi will work) https://www.raspberrypi.org/products/pi-zero-wireless/
1 × 2A 5V microUSB Power Adapter Even on a small Pi, you will need more than 1 amp to drive the 1.2" display
1 × Adafruit 1.2" 7-Segment LED Display http://www.adafruit.com/product/1268
1 × Adafruit I2C Backpack http://www.adafruit.com/product/1268
1 × I2S Decoder and Amplifier https://www.adafruit.com/products/3006
1 × Mini-SD Card https://www.adafruit.com/products/1583
1 × Cheap audio speaker (often scavenged from other things) https://www.adafruit.com/products/1891
1 × Momentary Push Buttons https://www.sparkfun.com/products/10302
1 × Colorful jumper wires https://www.sparkfun.com/products/12796
1 × Some short breadboard wire https://www.sparkfun.com/products/124
1 × LEGO® Bricks Used to build the enclosure. Because it's fun.
1 × Some 4.7k resistors https://www.sparkfun.com/products/10969