Yeah, they're going to make you go full retail on the barclay card
you might be better off getting a low interest credit card and finding a deal, or trying to finance through amazon
I did the barclay card when I got a MacBook for college back in the day. As long as you pay it off within the time frame you're paying no interest. Its pretty good. As soon as you pay off the computer the card is closed out. Its only for the purchase. I think you can always go in with another purchase at another time, but you have to pay the first computer off in full first before they let you make another purchase
A regular credit card might bring some unwanted trouble on the side