Gasket replacement cost

Hey guys! Wanting to hear from everyone’s opinion on the cost of my 2013 F sport gasket replacement. My engine light went in and P0302 cylinder 2 misfire is the problem. It rattles upon starting the engine when it switches from electric to motor. It’s leaking coolant but not visible. More than likely is leaking internally. I’m in Southern California, one place quoted me $3800 ( ouch) another place with more reputable sources was $1900. What’s the average price from people’s experience? Thank you in advance.