What is the cheapest traffic source?

pushup ads, but this may not provide you with the efficiency you want, such traffic sources are only suitable for those who do CPA.
 
You should consider the Quickest Traffic Methods. And choose the cheapest from these mothods. As I know, there are 4 quickest methods: pay-per-click, media buying, Email ad (solo ad) and Facebook ads. Depend on what you sell, you can use the method suitable. You question is so general, I just answer like this.
 
You would want to get on the Bing ads bandwagon as I still see a lot of potential in there and its still not that competitive like adwords and fb ads
 
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