Was I overcharged for a spark plug replacement?

I took in my car to the jeep dealership because my engine light was one. They said it was something about the thermostat. Replacement fell under warranty because apparently last time they replaced the thermostat they used a refurbished piece because they were low on them and now used a new Mopar one.

At that service they said I needed Spark Plug replacement. For that only, it was $726.00 Is that normal pricing? I'm in San Diego.

I'm a 25 year old girl. I don't know about cars. 😫😅