There must be a good placed manhattan grocery store with one delivery guy. If you buy lets say 0.1 bitcoin or more product they deliver it for free in anywhere at manhattan. Something like this would definetly work.
To move on to bigger stuff you can open another place at bronx or jersey or whatever, you know still bitcoin reachable place but close to your first shop , and move out like that until you have enough places.
Also germany seems like a place to do this , they are very into bitcoin.
I would suggest grocery stores to check up on delivery cost and product cost and find the best available profit margin just to implement bitcoin somehow. That would get your volume really high in a correct place. People of bitcoin and the ones who mined couple years ago spends hundreds of coins just on gambling , think how much they would love to get their groceries
you can even make more profit from bitcoin comparing to dollar.