Updated Amazon.com offers a $10 Credit for Amazon Video on Demand TV Series' when you enter code TVEMAILS. It was originally supposed to be for those who signed up for their newsletters last week, but it seems to be working even for people who didn't sign up. There are several shows available like Mad Men Season 4 and the newly released Dexter Season 4. Battlestar Galactica Season 1 is $9.99, so this promotion covers that cost. This is $10 less than iTunes. The coupon expires 8/19.