I went to the guitar center to buy a Yamaha keyboard for my daughter. Then I was told that it doesn't come with a power supply and I need to buy it separately. So I said ok, I will buy one. Then the sales person told me that they don't have it in the store but he can order it online for me. But he didn't mention to me that I need to pay the shipping cost. Then he took one hour to make the order. A few days later I changed my mind because I don't want to wait any more and I went to Costco to buy a keyboard which comes with a... read full review »