So you can either choose special delivery (which makes the total £37.99) and then takes £5 discount off - so the original £32.99 - basically you get special delivery for free.
When you come to check out, buy one of the DVDs it offers you for £3.00 - I bought The Office Chrimbo specials. (Didn't really want it) but it took the order to £36.98. Then that takes off the fiver, making the total order £31.98.
So you can bin the Office when it turns up - if you want to, but have saved a massive £1.01