Yes, true: T-Mobile announced last week by way of Twitter that it would be retailing the HD7 on November 8th -- the same day as AT&T's Samsung Focus and HTC Surround -- for $199.99 on contract. Thing is, it turns out that AmazonWireless is going to be selling it for $169.99 on contract which, by our calculations, is $30 less for the same product! Obviously, it's the norm for retailers like Amazon and Wirefly to charge less for phones on new two-year deals than their first-party counterparts -- but what's notable here is that Amazon will be undercutting T-Mobile by a nice little margin on day one. We