I buy a lot of traffic from
Choker as well as
Traffic Holder.
When buying from them, do a few tests to see what works best for you. I buy traffic for various projects I work on. Some traffic works great for something and not so good on others. It's just a matter of trial and error.
I also sell clicked text and banner traffic on drbizzaro.com and my network of sites.
You can read about it here and contact me if you are interested and had any other questions.