Same coupon at CP for those interested.

The two emails I got (one for SM and one for CP) have the rider :-

Quote - One per customer. Not valid with any other offers, discounts, trials or special upgrade pricing. Sale ends 11/30/2010 at 11:59pm PST. This offer is not available on any hardware products.

so it depends on what they've classified as "special upgrade pricing", meaning either your friend got lucky, or you're not choosing exactly the same item/pricing combination.