Comment by qingcharles

Was always a great source of original parts for prop replicas. Found a ton of exact Ghostbusters proton pack greebles there.

The other main source is the hazmat special:

https://apexsurplus.com/

(careful coming back through LAX with parts from there, it set off some sort of detector last time, although they took one look at the stuff I had, rolled their eyes, and sent me on my way)