How about a junk yard? Hack A Day describes Harvesting ultrasonic sensors and refers to Hacking Automotive Ultrasonic Sensors at Instructables.
As the comments indicate, the modern auto junk yard could be a good place to pick up sensors of various sorts and LED lights and all sorts of other stuff that might be a way to enhance some project idea or other.
This is a bit of change in thinking from what I’m used to. But that’s today’s interesting times where automobiles have a lot more interesting electronics components than they used to. So a junk yard isn’t just the place for mechanical stuff anymore, it seems.
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