This is a list of free online classified ads you can use to help.

This is still a relatively untouched resource for affiliate marketers, so I'm sure you'll have some success with it.

Adhysteria.com  
AdPost.com
BackPage.com  
CityList.com  
Craigslist.org  
ClassifiedAds.com  
ClassifiedsForFree.com
DomesticSale.com
EPage.com
EZClassifieds.com  
Facebook Marketplace  
GoForAds.com  
GoSasa.com 
Gumtree.com  
iNetGiant.com
Kijiji.com  
Kudzu.com   
MySpace Classifieds  
Oddbark.com  
Oodle.com  
Ollo.com  
PostPin.com  
Sell.com  
USFreeAds.com  
Vast.com