Non-search engine PPC?

We have ramped up our marketing budget and are almost ready to start Bing and Adwords campaigns, however we want to expand to a few more advertising methods on top of these. We think our best bet is to figure out where our target audience browses and individually ask those websites for advertising opportunities.
Is this how you would do it? Or is there a better, more efficient way to find effective PPC advertising opportunities? Would you focus on a specific type of website, such as news, blog, forum, etc?

See original post by RawAthletics