Scrounging for Fun and Profit
Guinnessy writes: "According to Toni Feder on Physics Today, scrounging used equipment is worthwhile if you can avoid the pitfalls of wasting time and compromising scientific goals. Feder interviews experimenters who have dug up everything from dewars to nuclear reactors."
Little tip to junk lovers everywhere: Every physics department has a room or two that they don't use for anything. What happens is that equipment that no one needs gets stashed there and forgotten. I've dug up everything from high precision mirrors to fiber optic by the yard, and bits of machined metal I couldn't identify but thought looked cool. It helps if your department hasn't redecorated and refurbished its digs in a long, long time.
When I was in high school me and a buddy of mine helped the chemistry department head "inventory" the stock during a big move. We got everything under the sun. Unfortunately, we found out that some of the containers were mislabelled, and nearly blew our heads off opening a can of ether.
Just a warning that scrounging isn't risk-free.
Oh yeah, one more - but they mostly are through a website and catalog ads (in Nuts and Volts, mostly), but they are based in Scottsdale:
Electronic Goldmine
Reason is the Path to God - Anon