E.M.
You have to remember moms go to mom2moms for deals. I hear a lot of complaints when items are priced high. Example right before christmas I went to one and people had their items high. If it was a month prior they would sell a lot cheaper. Items were not moving.
In general you should never buy a used car set, so you may have to sell those real cheap. The stroller can be a bit more, but as a rule of thumb for any sales (per HGTV) price it a 1/4 of what you paid for it. Yep, a 1/4. That sucks, but it is reality. I belong to a few different moms groups and we talk about how we got great deals on items at mom2moms. We also talk about the poor ladies that had their items priced too high and did not have items moving. If you want it gone, price it so it will be.