There are many sites where you can list them for free- try to get as much exposure to your names as possible. Add your names to as many sites as you can! That's what I do. It doesn't guarantee a sale, but it definitely increases your chances!
I have had many responses from free classified ads I have placed at ablazedomains.com as well as claimed.com's ads section. There are hundreds of places where you can list for free and the sites make no commissions from sales. Of course, there is nothing wrong with additional exposure in placing them on sites that do make a commission, especially if it is a very well-known source, thus increasing your chances for sales.
Anyway, just my 2-cents worth...:]
Good luck to you!