Millard,

Pick the Location(s) of interest...

Carefully and Creatively post every 48hrs...

Deleting so your Ad(s) stays on the Top of the listings...

Under the best possible categories...

Or where Applicants are passing through...

Always using Different Ad copy techniques Linkless as possible...
http://www.craigslist.org/about/sites.html

And...
http://www.topix.com/topix/advertise...
Free Classified Ads

Misc. possibilities...
http://www.city-data.com/forum/

Search out Local Blogs in needed areas that are somewhat related on topic(s)...

And post relevant Comments with your link and a nice little tie in to your needs...

http://www.placeblogger.com/
http://www.metblogs.com/
http://local.blogdigger.com/index.html

If I think of a few other Low cost... Free ideas... I'll post them...

Phil