So to answer the topic, there should be a constant asks about, if such a payment in bitcoins are available, to make retailers aware about the customer base.
As a consumer just ask ? "Do you accept Bitcoin ?" Business will bend over backwards to collect money from consumers.
As a business owner I give discounts for bitcoins. I would love to take bitcoins.. The amount of people who have paid me with bitcoins=0 The amount of people that have ask if I accept bitcoins=0.