Cost to Selling Apartment On Own

Could you provide a few more details:
What neighborhood is this in?
What price point?
How much free time do you and your spouse (if any) have?

Neighborhood: Manhattan (Greenwich village, west village, soho areas)
Price Point: $1.5M+
Free time: limited, but can schedule showings around

You could start by looking up some of these sellers and asking them: http://streeteasy.com/for-sale/nyc/status:sold%7Cdescription:fsbo?sort_by=listed_desc

It will cost less than a few thousand dollars. Don't forget cleaning crew and show sheets and other handouts. The value of your time is going to determine the vast majority of the overall cost.

Thank you!

Above 1million I would get an agent. It probably isn't going to be worth your time w joker low ball offers.