Most of FSBO is on MLS anyway. For what I have seen around here, they are on MLS with listing only service. You may be able to find some unsure what to do seller on Craiglist as well. My question is why FSBO?
Thank you for your email. I am posting more details on Trulia as it might help also other folks.
Owner.com is an example of a good FSBO site where you can search based on zipcode and specific distance from that zipcode. I searched for 02465 and within 15 miles. It returned 138 FSBOs. You can also get an email alert with new FSBO fitting your search.