Here are some PPC search engines:

http://www.enhance.com - (formerly ah-ha.com) was founded in 1999 as a
family-friendly search engine and has now branched out to offer paid listings, paid inclusion, banners and other contextual ads.

http://www.goclick.com - another good PPC search engine.

http://www.kanoodle.com - Kanoodle has partnerships with sites such as, NetZero, DogPile, CNET, Metacrawler and Turbofind.