I've been lucky. Other than a handful of things, I've been able to sell just about everything I wanted/needed to. I price stuff pretty cheap most of the time if I just want to get rid of it. For example, I sold my 2002 Impala in 2014...166k, abs/trac light on, rusty fenders and rockers. Asked $1,500, got $1,300 for it in less than 2 hours.

Even stuff that, prior to the internet, I would've just tossed, I've been able to sell. When we bought a new aquarium for our box turtle, we didn't need the lights that came with the tank. Put them on Craigslist as soon as we got home and opened he box. $20. Sold in an hour. Changed out all of the light fixtures in our house, put the old ones on CL for $50, gone in 2 hours.