Use a credit card and pay the bill entirely before the due date -- that way there's no interest, and it's the same as paying cash, only you get more protection and if the shipment is incorrect and the vendor won't fix it you have the credit card company to help you or reverse the charges. Plus, using a credit card often extends the manufacturer's warranty.
With debit cards, you are out the money immediately with very little recourse to get it back if the deal goes bad.
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