Craigslist and Ebay are well established markets but there are a few more options to consider as well.

1) Facebook marketplace. This is 100% free and with the added benefit of scammers being much less of an issue.
2) LetGo & OfferUp. I lump these two together because they are essentially the same competing free marketplace apps. Typically mobile phone platforms, you get a lot of, "passing through your area" pickers who will run these apps in the physical area where they are picking. Again, the scammer issue is minimal in these two apps.

Shipping is a separate issue but there are several companies who specialize in large item logistics. I've found that the well known carriers such as UPS and FedEx are not economical choices.