The new stuff you can buy is always limited to whats already available at your market. Your market might be your grocery store, walmart, amazon, a little local bodega, whatever, but if its not there you don't get it ads or not, and if its there chances are you can find it without an ad by going down the right aisle or using the right keywords.

Plus ads are fundamentally inefficient sources of information. Billboard lawyers like to flood the interstates with their "Accident? call me" signage, on the off chance someone without a lawyer has an accident and looks up and sees Jacob Emrani smiling on them. Big payoff for the lawyer if they do get a job from this ad, but for the vast majority of the millions of commuters a day who pass such an ad its probably a useless waste of thought to even catch one in your periphery.