Is the prices of gas at Costco the same at all Costco?

Is the prices of gas at Costco the same at all Costco?
I don't think so the gas prices are different from state to state.

To add to the above poster's answer.

Gas prices from one Costco not only differ from state to state, but also from city to city. Each Costco purchases gas from a LOCAL wholesaler and those prices can vary from region to region. For example, although not significant, here in Southern California, the price of gas from the Costco in Fullerton differs by about $.03 from the Costco in Irvine and Tustin.