Quantity   Component name
1 × Dashcam Monitor 3.5 inch TFT screen dismantled and with the 12 volt input bypassed to accept 5 volts to power screen
1 × Gameboy DMG shell Just need the shell and buttons
1 × Raspberry Pi Zero About 15 dollars once you do the shipping costs. Ebay has them slightly cheaper
1 × Button kit (silicone button pads and buttons themselves) Gameboy shell may come with one, but you really want the same pads / buttons for the XY buttons too...
1 × Low Pass Filter (filter out that processor noise from pi) 4 caps, 2 resistors, some kind of pcb to mount. Can just be perf board.
1 × Wiring cables (get braided copper not solid) Solid copper is way too strong, you want the flexibility for easy times when putting it together
1 × Gameboy zero Button PCB good enough, can just pull the PCB out of an SNES controller too
1 × 3.7 volt 8000 mAh battery Adafruit sells these
1 × PAM8403 Audio Amplifier cheap little amp to drive the audio to an audible level
1 × Adafruit Power booster 1000c I bought this when planning to use a Pi 3, zero MAY work with a 500c, read up on it.
1 × Gameboy Advance Speaker eh, it was only 80 cent