Monthly payment plans for macbook pro

I am planning to purchase a 15" Macbook Pro, but I really would prefer if I could pay off the bill monthly. I know that you can do the Barcalaycard, but is there any way to pay it off monthly without having to get a credit card? if I did get the credit card, would I have to use it for anything else or could it just be solely used to pay off the laptop? Can someone just tell me more about the card and if it's really worth it?