It's advanced organic search SEO. And there is no monthly adspend. What it requires is widely available city/zip databases and page content for the topic/product you are trying to reach potential customers with.
The trend in online retail is if your brand cannot afford a 5-to-6 figure adspend your ROI probably won't meet expectations.
Contact us for actual examples of this method's success.
We are actively seeking brands to join our retail group on Amazon.