Dealer buyers, how do the numismatic sellers find you?

I talked to a dealer earlier who said that google maps is how customers find him on deals he buys. How do you get a piece of the action without a brick and mortar store? Ads can be expensive and tend to attract people who think they have valuables when they don't. It takes a while for ads running to be taken seriously. Every business though has to do something to show a market presence.
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Secret of the trade.
Some find me on the internet, some find me here, most I find myself.
I am a buyer of Major Error Coins