i hav a debit card that i want to use to buy a 12 inch superdrive powerbook. only thing is, my debit card has a daily spending limit of $500 and the powerbook is going to be around $1500 with edu. discount. how will this be done? will i hav to fill my debit card to the limit ($500) everyday and apple will charge it everyday until it is fully paid for??? if not, how will it be done??? thanks.