1) Go to Adbrite.com using the following link:

2) Click on the tab that says "For Advertisers"
3) Click the option that says "Full Page Ads"
4) Now, you can set your targetting and keywords.
5) Now, set your budget. Set your Max CPV to $0.001 and your budget to $5/day (or more). That way, you will get at least 5,000 unique visitors/day. Each visitor only sees your page only once per 24 hours.
6) Now, set your ad details.
7) Set your billing details.
8) Once your campaign is approved, enjoy your traffic!