Have you been thinking of using Google Adwords for PPC advertising? You should... especially since you can test Adwords for free with this $75 coupon from Google:
https://services.google.com/fb/forms/adwordscoupon/
This offer is only valid for new Adwords customers who live in Canada or the US.
Source:
http://blog.fluxads.com/2012/07/free-75-google-adwords-coupon.html
via The News from http://onsuperbowlcommercials.blogspot.com