Suggest great ways to sale products online for free

I want to sale my products online on major scale. Currently my adwords campaign is runnning. I have also optimized my website as per search engine optimization point of view. I am also using google base. Are there any other ways where I can can advertise my products for free. I dont want to spend more and apart from google adwords.:D
Suggest great ways to sale products online for free.:)

Original post by Priti