What's good price on an 5-year extended warranty for 2010 infiniti FX35 with less than 20,000 miles?

A good one, if there is such a thing, these aftermarket non factory extended warranties don't have the best of reputation. But expect to pay $2500

The Infiniti dealership quoted me $2079 (for 60 months or 60,000; they also quoted me $1749 for 48 months/40,000 miles, and $2449 for 72 months/82,000), but mentioned that if I paid in full up front they could likely offer me a better deals. I am waiting to hear back from them.

I would say don't do it. They are great cars! Not worth the expense.