I just ordered a TiVo box from Costco. Now, I understand I must subscribe for the service through TiVo, but when I try to do that on the TiVo web site, it appears I must buy the box from them as well as the service. Unfortunately, their office is closed now, so I can't get my answer from them. Is it so that if one buys the box elsewhere, one cannot buy just the subscription from TiVo? In other words, we must buy both from TiVo?