Well you could hand out a pamphlet that talks about steemit, and says when you join, send your steemit username with this code number (add some serial number to the pamphlet) to this email adddress [email protected]

...and when they do, you now get their email address, plus you can manually send them some steem to their steemit username that they give you in the email.

I mean that would work in the beginning. Naturally we'd need some software to do that if this becomes busy and popular. But as a marketing test, you could do it manually this way to see if is popular.

This way you could also build up a marketing newsletter to your customers as well as introduce people to steem at the same time. :)

if someone walks into my store (I am actually sitting in right now by the way)

That's very cool that I was talking to someone in a real shop with this idea. :)

@timcliff was handing out 10,000 pamphlets you can see some designs on this post:

https://steemit.com/recruitment/@timcliff/10-000-flyers-steemit-marketing-campaign-status-update-and-how-to-help

(look for the links in his post talking about it, to see example designs)