Where I live, people sometimes organize "markets" where they bring stuff that is potentially useful but they have no use for it. Everyone brings whatever they want, and everyone takes whatever they want (first come, first served). Sometimes there is a specific topic, e.g. "clothes" or "stuff for kids", sometimes there is no topic. In theory, I would expect that such place would attract e.g. all homeless people around, which could make it quite unpleasant for other participants. But in practice, this doesn't happen, probably because those activities are usually organized online or through personal lines, so it's mostly middle-class people coming there, and many of them bring more than they take. Usually people take home all the stuff they brought but nobody else wanted; but sometimes there is an explicit rule (e.g. with the clothes) that at the end, all the untaken stuff will be collected by the organizers and donated to some charity (so it will "trickle down" towards poorer people until someone takes it). So, if this is important for you, I recommend first doing some research (online, asking your neighbors), and if you can't find, maybe you can organize it. Find a few people to help you, rent a room with some tables (is best case, some organization sympathetic to your goals would lend you the room for free), send invitations on facebook. Call it a "no-money market" or "neighbors' exchange" or whatever. Maybe the first time you organize it, make sure you have at least five people who don't know each other and want to get rid of some potentially useful stuff.

Well, but is there any value there? If you can't even give your old comics away, trashing them is not a "waste". Your 10-year-old modem might still be functioning, but if no one wants it, it has no value.