Have you purchased a lot from the apple online store in the past, because i have only ever got an iPhone 3G, a Bumper and my iPhone 4s and she didn't offer me anything.
Ive purchased A LOT on there... several computers, iPods, etc.. and I got a free case. It was some incase clear ugly case so I asked if I could switch to a bumper case, and she was happy to switch the case for me. I got a tracking number laster that day saying my case has shipped and will receive it on tuesday
not as good as $100 gift card, but still good... better than nothing..