Meanwhile, I thought of other free means of advertising and looked for classified ads website. Through Google, I found this list of top 5 free classified sites and I have placed ads in all of them. I have in fact used most of them before except for Locanto which is new to me.
5. Singapore Expats
My previous experience is that these are not exactly effective. Easy enough to use and no harm trying. Let's see if things are any better these days.