Comment University Surplus stores (Score 1) 267
Many universities have "surplus" stores where all their old equipment goes to die. You usually can wander around at your leisure and often times even look inside things to see what you're getting. Especially old scientific equipment has large amounts of salvageable stuff in it, and if it's broken it's even cheaper. At the university surplus store here there are many artists who get their sculpture parts (though I don't know of any doing kinetic sculpture in particular).