We purchased it used last year for the kid. Knew we would purchase the extended manufacturer warranty later.
Knapp came up on my AI search and I have spoken with them. Pretty straight forward. Sent me a quote with no hassle. Found out by talking to them that you do have to get this completed at least 30 days before the 3 year point of in service and a certain amount of miles. Something to keep in mind when waiting.
Tried another source recommended out of MT They responded with pages and pages of info but no actual quote. Less helpful.
Also called Ewing GMC/Buick here locally and their prices were about the same. about a hundred more on the platinum 72/72k with $100 deductible and a hundred less on the Platinum 72/72k with no deductible.
I guess you can pretty much call any GM dealership. The Knapp guy said they have developed a volume model and got special pricing. The quote from Ewing brings up questions about that. Also the difference between 100 deductible and zero deductible is only about $400.
Now that I have two quotes, one from a supposed known low price provider, that are in the same ballpark, I will probably just use Ewing. I want the no deductible one because we will "give" the car to the kid upon graduation and want to set her up as well as possible.
ETA:
I might be misunderstanding, but they make it sound like the extension starts the day you purchase it. So if you purchased when you bought new, you would get a 72 month / 72k warranty. If you wait to where we are with three years from in service being October 15th and the car having 25k miles, we end up starting from this point for an effective length of 8.5 years and 97k miles.
No idea what pricing difference may be. But seems weird to me that it is set up that way and not simply an extension on the 3/36k. base warranty.