We're actually using the most popular SE to promote our website, however we're constantly looking at new possibilities to expand our traffic (and conversion) volumne.
The problem I'm facing is that the alternative I've tried are too expensive and low quality, not so many platforms have the quality of adwords or bing. So we're looking at cheaper options like remnant advertising. I understand that the base of this type of advertising is re-sell the unsold ad space at a discounted price. But, how can I buy those spaces? What platform are using this kind of advertising? Does Google have a similar option?
Thanks to everyone!