Quantity   Component name
1 × ATtiny3224 Expensive for this application, but all that flash helps with Neuromancer
1 × 0.91 inch 128x32 SSD1306 OLED Common breakout board, best price I could find was ~$1.10 each
1 × Würth 434331045822 Tact Switch I picked this because it was used in the Open Book project, but very expensive.
1 × 2x3 SMD Pin Header Use of surface mount header is frowned upon in SAO circles. I don't care.
4 × 1206 LEDs (Red, White, Blue, Green) Must be manually mounted upside down. Turns out 1204 side LEDs work too.
1 × Passives Four resistors for LEDs, couple resistors and cap for button debounce.