I am currently looking at Fry's weekly ad, and at the bottom is clearly states:

"Prices and/or selection shown in this advertisement may not be available online at Fry's website: www.FRYS.com"

the $50 gift card was in-store only. You have no case.

On March 2, 2012 I purchased a Samsung 7" tablet for my wife from frys.com. On the ad it stated a $50 Frys gift card was included. When the order came, there was no gift card. I called fys customer service & the rep had to put me on hold to talk to someone. He got back on the phone & told me the offer was for in store only. The ad for the product never stated that!! I sent numerous emails to customer service at frys, to no avail.
I believe that this is considered FALSE ADVERTISING (FRAUD).

Nothing in the whole ad (or website) that I saw said anything about in store only for the gift card.