You can purchase the Amazon shows via the web. If your TiVo is registered with Amazon (it will have to be before it can download shows), then you'll see it on the website and can select it to "push" the shows directly to it. Buying from the web lets you pick between HD and SD versions of TV shows. However, last time I checked, movies purchased form the web could only be pushed at SD quality. If you want an HD movie, then you have to purchase it through the TiVo.