WANTED! a GOOD free advertising site. in Jacksonville, Florida For Sale

I'm looking for good free sites besides Craigslist. I know there are lots of them but it takes so much trial and error finding those who actually deliver customers. Most of the sites I use now, carguru, penny pincher, oodle all offer little results. 90% of the replies are scammers even on craigslist. I would really like to know if there exist any truly successful free sites. The paid ones are no better. Thanks and good luck.