Why is the % saved only displayed for some refurbished products? I was browsing the listing for the refurbished iMacs and noticed that some of the items explicitly state how much is being saved while others do not.  While it is easy to calculate the savings yourself, I wondered if there was some underlying reason for this.
I believe those entries for which percentages are not shown are build-to-order models. Of course there was an original retail price so there's no reason why the percentage saving isn't shown, but Apple has decided not to display it for some reason.