These extended service plans are a product for the dealership to sell just like mud flaps or brake repairs. They are a big profit item with a commission for the guy making the sale, a profit for the dealership, a profit for the underwriter, and something left over to pay claims. You can buy them on-line from a Mazda dealership, or independent outfit, usually anytime up to the end of the factory warranty. The independent outfits have the problem that if they go broke, you're left with nothing. In any case, if you buy, negotiate hard on the price. Find out in advance what the price is on-line, and don't pay more.
These are really peace-of-mind insurance. Buy them if you'll sleep better. Most buyers lose money with them. A few come out ahead. If you buy, read the fine print very closely. Find out what is covered, what is not covered, what you have to do to keep the coverage in effect. In some cases you need to do specified maintenance. It might be different from the owner's manual maintenance--read that fine print.
Here's some pricing:
http://mazdaextendedwarranty-bachro...r=2016&model=CX9&state=WA&inservice=&prcTwo=y