For the most part car prices are negotiable. There are a few places that are "1 price" and they're non-negotiable on price. Usually, those dealers are very up front and advertise that part of their business. The days of being able to negotiate $1000-$2000 off a used car seem to be gone. Large dealers use price as a competitive advantage and are generally within a few $100 of what they'll take as an acceptable offer. Unless the car listed says its a high price I'd anticipate being able to negotiate a little but not much.
Yep they are negotiable....
That's between you and the seller. Most people and dealers will negotiate the price. But some will not. Carsense, for example, will absolutely not negotiate a price. The listed price is the final price. HTH. -Jim