Thanks for the suggestions; considering my cost, I will consider doing only 3% off for customers paying with Bitcoin; I think that will make them happy. Also, with that, I think I am going to edit my display and indicate 3% off for payment in Bitcoin.
You know best how much discount you can allow yourself, but if I were you, I would consider rounding that amount to 5% because it will have a much better effect on people psychologically. Sometimes you need to put yourself in the shoes of the buyer in order to be a good seller
Already, I am working on printing some flyers and stickers to distribute within my area.
This is surely something that will bring you new customers, because advertising is the key to any serious business. If people don't know that you exist and that you offer payment with Bitcoin, you can only hope that someone will come to your store by chance.