Circuit City is no longer open in the United States. They announced their closing a few years back. However, you are still able to purchase through them online.
Each Circuit City store can have different hours. For instance the one in my area: Sunday 11:00am to 7pm Monday through Saturday 10:00am to 9pm To find a store near you I have added a store locator...
An open circuit is a connection that is disconnected. This can cut off parts of the circuit, losing some key functions, or it can halt the circuit entirely.