It's my understanding that, provided you already have a DJ's store card, you have the option to purchase B&O products through DJ's on terms of up to 2 years interest free at any time. Extended periods are sometimes available depending on the promotion - but as always, you'll need to check the fine print.
i advise against this though. I was charged an account establishment fee per transaction, and for 4 years (48 months) you pay $3 per month account keeping fee > interest free? no such thing.