Q: How do I get rid of the remaining 3 cents in my iTunes account so I can change the location?

A friend of mine gave me an iTunes card containing 25 pounds, but I'm on the U.S. store. I'd like to change to the UK store, redeem the card, spend it on what I'd like and go back to the U.S. store, but I can't. I get a message saying I need to get rid of the remaining balance in my account, and it's too little to be used for anything. How can I remove 3 cents from my account?