We have a local "creative reuse" store, and they've got a lot of odds and ends for sewing -- fabric, trim, thread, etc. Also about a dozen sewing machines of all vintages, most for only $15.

I've been shopping for various snap-on feet for different DIY sewing tasks. It dawned on me that this reuse store might have some feet... and sure enough, today I found they had two bins of 'em! Many old and heavily built, many I have no idea what they are. But I scored a few today, $1 each:

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Clockwise from top left: a walking foot (seems much better built than the new one I just bought, which will be returned), what I think is a binder attachment foot, a 1/8" rolled hem foot, and a teeny-tiny rolled hem foot.

There were others that looked really cool... may have to try to ID them.