[AlaskaErik]

I've signed up for the card to get the discount. Then paid in full, and then immediately cut up the card.

But you're still hurting your credit score.

[dfwgator]

If you have good credit already, it really doesn't matter that much. If you are a borderline case, I could see it being an issue. In that case you will have to notify the bureaus that you've cancelled the card.

[Cobra64]

But you're still hurting your credit score.

Bingo! Too many people do not understand that. Mine is close to 800. And, because of that, we got a much better mortgage rate when we built our new house two years ago. Then, we pay our mortgage on an automatic (transfer) semi-monthly basis... mortgage will be paid off in 12 years.