Super simple to check your balance. Most people don't even know about the balance on a Costco card so it's great that you asked. What your going to want to do is when you have your Costco card out, Point your index finger outward as if you're pointing at someone. Place the card on top of your finger and place it so that you can let go of it without it falling off of your finger and you will have the exact balance on your card.
Go to customer service
I don't think u can
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