Amazon marketplace used to be brilliant for this, could pick up classics for barely more than the cost of postage. Not sure if Amazon seller terms have changed or the used book market is different but I see even used copies going for a lot more these days.
So I just keep and eye out in thrift stores and library sales
My wife has grown to hate library sales more than she hates the dreaded dip. She's a big bitcoiner but still can't stand the stress of me salivating over a good dip. Library sales though...probably one of the largest (mostly playful) conflicts in our marriage.
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