I did one a few years ago at the Baby & Kids Market, back when I thought we were stopping at 2. We had a cradle, swing/rocker thing, heaps of clothes, smaller toys, wraps/blankets and about 40 MCNs (greenkids). My nappies sold literally within 10 minutes of the market opening and I could have sold them a dozen times over. Basically I sold everything except for probably half the clothes. I had decent to higher end stuff priced what I thought was reasonably ($1-$5 per piece for most things) but brought most of it home and then gave it to Good Sammies. I don't remember exactly how much we made, but it was close to $2K so well and truly worthwhile

If you don't want to do a market there is a pretty good second hand market on various facebook pages for MCNs