Questions about the Nintendo DS Action Replay.?

I have an action replay, and I love using it to play Pokemon pearl. So far, I have only had a problem once, and I just shut off my DS. I have heard that if you save the game, when you encounter an error with the codes, you are in big trouble, so I just shut mine off the one time I had problems. You can use the AR to catch EVERY pokemon, including the event pokemons that haven't even been released yet. It is awesome. Mine came with a USB cord, and a disk, for the computer. I get free codes from supercheats. I have never heard anything about a subscription. I am finding all the cheats I want online, and not paying for them. I don't think you are going to save much money buying on Amazon, but it probably doesn't matter too much where you get your AR. I am so glad I bought mine.