I bought a 7 inch display that the Raspberry Pi connects to. I wasn’t entirely sure why I bought it but I thought it would come in useful at some point. Oliver had the bright idea that we could make it into a mini-arcade game for his room. Turns out he was right.
The speaker was a gift from a long time ago that has just been gathering dust and the USB joystick was a cheap purchase from Amazon to test using joysticks on the Raspberry Pi before building my cabinet.