Anybody know how to view Amazon promotional discounts? I thought I had $1 in MP3 credit so I bought a song (Coheed and Cambria's "Welcome Home") but it cost $1.29. I wasn't charged anything. So I go looking around in my account and it claims I have no gift balance, which is right because my dollar was only good on MP3s. So, how can I see stuff like my MP3 and video game balances?