Marchex - Several advertising options including PPC. An excellent company to do business with. Very professional.
Part 18 - List of Pay-Per-Click (PPC) search engines
Kanoodle - RLROUSE.COM uses Kanoodle for many of our Pay-Per-Click campaigns. They're inexpensive, easy to use, and very effective at driving highly-targeted traffic to your site.
Google Adwords - Excellent PPC option from Google. No deposit is required to start using the service. Super service from the #1 name in search.
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