That's the short story.
The medium length story is that they apparently did not consider the frenzy that would unfold when releasing a coupon offer for $50 off a $100 purchase. They have since added more exclusions and changed the expiration date on the coupon to yesterday. Rumor is that they are declining coupons today even if they show that they expire today.
The verdict: it was great while it lasted, but don't waste your time trying this one.
If you'd like to voice your opinion about this, feel free to do so on their Facebook page. They are getting blasted today. People are saying how much better Amazon is and it appears as though they lost a LOT of customers.