It used to be computers when prices were up. Now I would have to say car/marine batteries. Price has held and they are heavy and don't take up a lot of space. I would quit my day job if I could get a van full of those a week. Added bonus: no dismantling required!
Without profit in mind, I would go with computers/microwaves. They don't last 5 min when I set my sights on one with drill in hand.
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