everytime i go to radio shack to buy a resistor, they ask for my name, address, email, telephone number, zip code. haha.
I remember sometimes people put out a fishbowl at a table and ask for business cards or addresses, and give away some card as a prize if you put it your name and email/address.
gun shows are popular and the gun show in my area allows baseball card dealers to set up if they want.
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