I don't have this automated, but this is definitely still a thing, at least for used test equipment. I'm not clever enough to automate it fully, since often constructing the search terms is fairly difficult, but I definitely have scored some incredible deals ($40 for a perfectly fine HP spectrum analyzer a month ago). The only automation is some simple greasemonkey scripts, but there are definitely deals to be had on mis-categorized items. Likely this works best on specialized equipment that the average bulk auction buyer doesn't recognize, I would suspect that most industrial/scientific equipment would apply. This certainly won't apply to consumer items like a laptop though, the item has to be esoteric enough that a non-expert has difficulty even determining what it is.