1) This ad space gets more than 10,000 impressions per month. 2) The site ranks on first page for couple of keywords. 3) Site gets more than 5000+ visitors every month & increasing. Cost: $10 / month. Site Link: Fist link in my signature.
advertise free on elistr.com , just post an ad and invite some friends, your ad will be upgraded to "Featuerd on Home Page" and you can have your banner put on the site free.