Transforming Credit Cards into Debit Cards
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That just needs a little discipline to keep note of your current credit card balance. When the credit card balance starts heading down towards zero, just transfer a few hundred bucks or so across to it online from one of your other bank accounts.
That way, you'll always have a credit balance, and you'll keep your money in your own pocket instead of it going to the Banks as high-rate of interest payments on your credit card.