what product would you search for on both craigslist & amazon, or craigslist & amazon & ebay? the sites are very separate for me, craigslist is for apartment h

what product would you search for on both craigslist & amazon, or craigslist & amazon & ebay? the sites are very separate for me, craigslist is for apartment hunting or free junk i don't want, amazon for books, and ebay for some really niche thing.