The dealers actually tack on
thousands in the finance office...and it's usually a 3rd party policy.
I recommend a Mopar Extended Service Plan (ESP). They are attached to your VIN, every dealership is familiar with them, there's no hassle when getting work done, and they won't go out of business.
There are others that people will chime in with but I recommend starting with Zeigler:
https://www.chryslerfactoryplans.com/
They are always near if not the lowest price for a Mopar ESP. They usually have discounts you for paying in full (all at once) or financing (you can put a down payment then pay the rest off in 12 equal monthly payments).
I went with Zeigler for mine. I may have payed $50 or so more than the cheapest (which is negligible for the $3K policy I was buying) but there were a few reasons why I went with them:
1. I was talking to the dealership. Every time I called someone answered the phone and helped me. I didn't have to play phone tag with one person's voicemail.
2. They had flexible options for financing. I couldn't pay the lump sum up front and they had the most options for down payment (some only had one or two) for financing.
3. They usually have several discounts available for lump sum and financing. If you call them personally they sometimes shave off even more cost.
Like I said, there are others that many go with and are happy with. If you do some searches you will find a half dozen or so that are the most popular and you can decide from there. I was very happy with Zeigler - they made it a very easy experience from purchase to pro-rated refund when I sold my truck.
Just my .02