Almost forgot
If you are looking for surplus stuff the U of M property disposition usually has some interesting stuff. All kinds of old instruments and electronics. Not nearly as much cool stuff as they used to, but you might find a few gems here and there. A decade ago they were clearing their physics labs and had all sorts of awesome stuff - giant HeNe lasers, bell jars with vacuum bases, lab-grade microscopes and scales. They had a small cyclotron for $500, and by small I mean the size of a mid-size truck. While you're in AA check out the Reuse center, they sometimes have cool stuff there, too.
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