2004 Honda Accord Compliance Bushings

Hi,
I recently when in to my Honda dealership for routine maintenance and they mentioned that my compliance bushings were worn and recommended replacement. They were looking to charge me around $350. My question is two fold:
1: How often should I expect to replace compliance bushings (and what are they exactly)? The car is not heavily driven.
2: Is this a decent price? Is this something that should be covered under a certified pre-owned warranty?

I bought the car in 06, certified pre owned.