Granger and Zeigler are the same price. With Zeigler, you need to put in the code "payinfull". That gets you a $360ish discount on the price shown when you check out.
There are several places that will sell the policy at near cost. Whichever you go with you can't go wrong as it's the same ESP.
Zeigler does offer more options if you are going to finance the policy for 12 months (down payment options and discounts).
At the time I purchased I went with Zeigler as the others that I was considering was a single person at a dealership. With Zeigler I was dealing with a dealership so someone always answered the phone when I called...no e-mails or phone tag.
...Oh the price on warranties are said to be going up around 5% on Jan 01 2024.
They go up every year. There is also usually a spike around mid-year then subsides (mostly) by the end of summer so keep that in mind as well.
FCA is a for-profit business and factors how much they paid out the previous year for warranty work into future pricing. Basic warranty work gets added to purchase price (MSRP) and extended warranty work gets added to MaxCare price (ESP).
At least they can recoup some of their "losses" for policy work by adding to prices elsewhere and writing some off as marketing (come in for work, get your regular service work done too, and maybe buy another vehicle while you're stuck on the lot waiting for the work to be done).
3rd party policy companies I'm sure make money on investment income from policy sales but, based on a lot of comments I've seen, I reckon they rely heavily on policy purchase price and not paying to fix your vehicle.