Hi,
Do you require posting to be made on free classified sites?
What is is the industry and market for which posting has to be done.
It would be good if you can share more details.
For example I did a project where I searched top sites that would come in page one of google.
Then I would contact the site owner and he would place clients websites link for negotiated price.
Please provide more details I would come up with specific plan and sites.