I Am Bored. As the name suggests, the traffic from I Am Bored is people who are looking for some fun. You cannot count on them to buy your products but if you have a site that offers some form of entertainment, I-Am-Bored.com is a good bet.

Rates
Their current rates are $100/week and you can buy a link on I-Am-Bored.com from AdEngage (a service similar to AdBrite).

How Many Clicks Can I Expect?
According to the stats shown there, you will receive an average of 3500 clicks per week, but from my personal experience, you can even receive up to 6500 clicks in a week if you have something really interesting to offer.