My hubby deals a lot with IT stuff. His recommendation is to NOT buy ANYTHING online with a debit card. Once a merchant has your number, they can keep charging you for something, (like the ACAI scam) because a debit card is an extension of your bank account. So...if you are buying online, use a credit card, as it is much easier to stop unwanted payments. (I work in a credit Union, so I know first hand he is right. )
Patti