Well, it's very obvious reading that reciept that everyone is right. $50 balance remaining on the gift card.
But, in case it helps anyone... I just got the keyboard kindle, 3G, for under $100 including tax. ($139 retail)
I had $42ish in Staples rewards, so I used them to lower the price. And even better, my business spent the original money to earn the rewards
OP, sorry it turned out not to be a great deal. Even for $100, you will still love the Kindle, I can't out mine down