I am not spending my bitcoins at a moment in real world as there are no shops in my area that accepts bitcoins so I am spending them only on trading sites as the usage and acceptance of bitcoins is very limited in real world at a moment.
Although you said like that. However you can try to exchange your Bitcoin to flat first and then spend them to buy anything you want in the shop. Merchant allowed Bitcoin as the payment isn't going to be easy task because it depend of how popular Bitcoin in your city