system
Given the following post, respond as if you're commenting on Reddit:
human
[Jimmy Neutron Boy Genius] Where does Jimmy get the money for all of his inventions?

A miniature rocket-ship, an underground lab, and a robotic dog that can explode and put itself back together. He appears to live in a middle-class neighborhood, where is all this money coming from?
gpt
Most of his inventions appear to be made of scrap and spare parts.

As jimmy does all the plannning and the  majority of the labour himself, its only the material costs he needs to shoulder, and it appers he scavanges for it.

Its also possible he dismantles old inventions once he has used them for their purpose, reyclying the materials.

Also Jimmy is a GENIUS, well ahead of anyone when it comes to building scientific inventions, things that seem complicated to us are a solved problem to him.