Here is Costco's return policy
Membership: We will refund your membership fee in full at any time if you are dissatisfied.
Merchandise: We guarantee your satisfaction on every product we sell with a full refund. The following must be returned within 90 days of purchase for a refund: televisions, projectors, computers, cameras, camcorders, touch screen tablets, MP3 players and cellular phones.
How to Return: For an immediate refund (including shipping and handling), simply return your purchase at any one of our Costco warehouses worldwide. If you are unable to return your order at one of our warehouses, please email customer service or call our customer service center at 1-800-955-2292 for assistance. To expedite the processing of your return, please reference your order number.
If you request an item be picked up for return, the item must be packaged and available for pick up in the same manner as it was delivered.
If your order was delivered "curb side", it will need to be available for curb side pick up.
If the item arrived to you in a box, it will need to be in a box at the time of pick up.
Read more additional returns information.
Electronics trade in: Through our Electronics Trade In Program, powered by Gazelle, you can receive a Costco Cash Card for the current value of your used electronics. Visit Costco.gazelle.com to find the value of your electronics from computers to cell phones, cameras and more, then ship in your items (shipping is free), we will send you a Costco Cash Card for the total value of your used electronics.