If the item is unique and a limited market, maybe an auction house is best despite the fee. Most quality ML have a limited market.
What you get for the auction house fee includes: advertising to thousands of prospective buyers, collecting payment (which can be messy with bad checks, disputed transactions, etc), packing and shipping and handling and damaged-in-transit issues, and general complaints ("this doesn't look like the image you posted and I want my money back").
For a private sale with word-of-mouth advertising, buyer inspection & buyer pick-up from your place, cash sale ... probably not worth 19%.