If it's like my community, the normal trash collection is limited as to what can be disposed of. So every so often the city has days assigned where they will come by and collect anything that you have to dispose of. It's like a Junkfest. People will put out anything. You get the usual items like old couches, stoves, etc. You can go down the alleys and pick up nearly anything before the city gets it.
It's great for cooling parts. Over the past few years, I've picked up maybe 2 dozen or so compressors from fridges and about a dozen tossed a/c units. The companies downtown also paticipate and I've picked up whole computers from them. Most of it is junk, but you get a gem evey now and then.