The only way to get your FSBO home listed on Trulia is to have it listed on the MLS. Only agents have access, but you could also pay for what's called a flat fee listing service if you want to sell by owner (generally not a good idea).
We created UpNest (http://www.upnest.com) to help home sellers get the best value possible. All you have to do is submit a few details about your home, and we'll invite several top local agents to submit proposals to you.
Since agents are competing to earn your listing, they bring out their best commission rates and value added services, saving you a lot of money. There's no risk to try us at all, and it's completely free for you.