Places in Sydney to get those more geeky things:
Reverse Garbage takes things people no longer want and make them available for you to exercise your imagination on. You can’t be certain what you’ll find, but you can be sure you’ll find something you can do something with.
Little Bird Electronics is my favoured goto place for all sorts of electronic needs. They’re unfailingly helpful.
Professor Plum’s is just cool stuff in Crows Nest.
Neat Geek provides local online shopping for geeky things at a reasonable price.