careerbuilder and monster job postings

We need to post job ads on [login to view URL] and [login to view URL] websites. We don't have an advertising account! I will be willing to give you a test job to prove ability to get on sites We are willing to pay no more than $20 per posting on each site.(20 postings a month to start with). So please let me know the number of ads that you can post per day or month.