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 power supply. Then I went back to the Guitar Center to return the keyboard and the power supply. Then I was told that I cannot return the supply because it hasn't arrived to the store yet (they seem to only ship to store). So I waited it to arrive the store and I went there one more time to return it. The entire process I didn't get to touch the power supply. But the sales person told me that they cannot refund me the money because they are using different system. So I have to wait for the item to reach when it came from and then get my refund. After waiting for another 10 days, I still didn't get my refund so I called the customer service to check whether they have received the item. Surprisingly, the customer service told me that the store should refund me the day I returned the item because the online store should have return the money to the store. So I have to make another trip to the store to argue about my refund. This has been a very unpleasant shopping experience to me. I would never go to this store to buy any stuff no matter how appealing the price it, neither will I recommend this store to any of my friends.