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on 3/6/16You can't use a prepaid card with zZounds. They require a bank issued debit card or a credit card. So long as you use your bank issued debit card that is linked to your checking account, you will not be charged interest. Or, use your credit card and pay it off to avoid interest.
Your claim that zZounds is lying about charging interest is untrue. They don't charge interest at all. If you choose to not pay off your credit card balance and let interest build, that is completely your decision and not zZounds.
Hope this helps answer your concern. I buy everything from zZounds on payment plans, never been charged interest as I use my bank issued debit card. :)