Where is advertising cheaper?

Question

contextual advertising

For example, there is a MyTarget list, Facebook Ads, Yandex Direct (Search + YAN), Google Ads (Search + Display Network), Insagram, teaser networks, etc.
Where can you advertise a product or service inexpensively? I tried advertising on Instagram for a service and the ad did not work, although the ad and settings were configured correctly

Answer 1

The cost depends on the audience, geo, coverage. In addition, it is more correct to proceed not from the cost of advertising, but from the cost of the conversion / lead / order that you receive from it. And the volume that you are interested in or you can get from this source.
And to find out these indicators, it is necessary to test the sources. It's different for everyone.

Answer 2

Everywhere there are no restrictions on the minimum amounts, if there is some traffic you take and use a suitable advertising network