when new they come with so many credits, used will have the credits used up and you end up sometimes needing to buy more credits to tune your own car.

used is worth it sometimes too. not a big deal.

depending on year and engine, you can try to find a DHP, its for v6 only, and only up to 05. its a older tuner but gets the job done, its what i and many others use. its just not as fancy as HP tuner.