Many employers use job portals such as Monster.com or CareerBuilder to advertise their jobs.  These job portals cost $300+ to list just one job.  What many employers don't realize is you can effectively advertise your job listings for much cheaper and gain a much wider audience.  Following are a few useful methods you can use. 

1. Use a job classified ad syndication service.  A good job syndication service such as ClassifiedFlyerAds.com will allow you to create a full color online job flyer and have that job automatically posted to top job portals.  Your job flyers can also be optimized for search engines, which enable your jobs to appear on the first page of search engines such as Google.  This will allow your jobs to be seen on over 20 top job portals and costs under $30.  So you decide - $300+ to post on 1 job board or under $30 for a full color online employment flyer that is posted to over 20 employment directories.
2. Place your employment opportunities on your own website.  Many times employers don't do this and they miss out on employees who may be visiting their website looking for opportunities.
3. Start a blog about your company and post the latest happenings within your company.  Also post any current job openings.
4. Post your jobs on Craigslist and Backpage.

 Try the above methods out before you decide to spend another $300+ on 1 job board.  You will be surprised on how effective these methods are and hey maybe you can offer the hundreds of dollars you will save as employee bonuses.