its simple. find sites that offer free ad postings. the more sites you post your ads, the more people will see. example craigslist and backpage are free sites you can post your ads.
here are more to get you started:
AdLandPro
AdPost.com
InetGiant
USFreeAds
Ecki.com
Kijiji
Sell.com
Yahoo
Excite
eBay Classifieds
you can post on any of the B2B marketplace portal because they do provide free services.
not here
but you can use the yahoo Answers, but you should post them skillfully.
