I have not seen people have any luck selling condos on their own. You won't get any drive by traffic. Qualified buyers who are serious about buying a home will work with an agent because it does not cost them anything. Most condo are sold to first time buyers, and they want someone to hold their hand through the process. Your best bet is finding an agent who specializes in your area of town so you will be exposed to all the agents who are working with buyers in your price range.