I'll try to get some answers for you... 1. The Amazon Unbox does NOT work in Puerto Rico, since we are not a US state. They can tell where you are by your IP address. If you could somehow fake your IP address so that it tells Amazon you are somewhere in the US I guess it would work, but I don't know of anyone that has done this. Instead of renting or buying from Amazon Unbox I use the Netflix service (not the online portion of it) to watch all the DVD's I want for a fixed monthly price and no late fees. 2. I don't know the current pricing in Best Buy, but I got mine in Costco for $249.99 + tax. You may want to check it out if you, or someone you know, has a membership. 3. Regarding on-line account setup... I believe you need to call TiVo to setup your account and then you can make whatever changes you want on-line. They may have changed this, I guess I would try it before calling just in case. 4. I'm not sure what you mean by "use my cable decoder directly connected to the tivo hd decoder so i can star setting up my account before i get my cable card". If you mean connect your cable modem directly to the back of the TiVo, then you can NOT, you would need to get a wired hub (some are very cheap) if your modem is next to your TiVo or a Wireless Router (more expensive and harder to set up) if you will connect your TiVo wirelessly (you would also need TiVo's wireless adapted, which is locally available at some Radio Shack locations). ...If you mean something else, please explain. If I were you I would activate the TiVo and get it working without CableCards, then force the connection to TiVo several times until you get the latest software version (9.3?) before you install your CableCard. Good luck getting your M-Card!