There are many places to advertise your job vacancies if you have a computer and internet access you can start right away. There are many places to advertise your jobs online, im sure you have heard of the big names on the internet, the problem with these companys is that they charge alot of money for listing jobs, this can be very expensive when you are a large company and have many job vacancies to fill. Some do offer a discount when submitting a large amount of job vacancies. If you are a local business you need to be advertising your jobs locally and with that inmind this will insure you reach your target audience.
With the current climate at the moment there are not enough jobs out there for job seekers, there is far to much demand for jobs, so with this in mind you may have alot of applicants applying for the same job. This is good news for the employer but not so good for the job seeker.
As a employer myself i always advertise my job vacancies locally, and try not to use the big companys in the business, one because there job listing fees are way out of my budget and two i dont think you are reaching the rightaudience for your job vacancy.
This may work for some large companys and recruitment agencies,but dont forget they have very deep pockets, and when your listing your job vacancies locally you are giving something back to your community.