I think it's highly dependent on where in the world you live. I notice most of the respondents here are stateside, so Craigslist and local adverts have a relatively huge pool of advertisers. For me in Australia there is not much at all on Craigslist and only the occasional item (of interest to me) on Gumtree, a once-independent marketplace site now taken over and owned by eBay. So for me searching eBay AU, US and UK is the primary way in which I obtain things.
has anyone had any luck hitting up local recyclers that might allow one to pick through their old stuff? I tried calling a few but they didnt seem to happy with this idea.