Hey jasondew
I actually have a simular problem, it hasn't been full confirmed yet, im trying one more desprite measure....Anyway my headgasket is/might be leaking coolent and the pistons might be compressing the coolent, SO to ur question someone told me around 1200-1800....I know, a hell of a lot of money just for a $20 part...if u were a real DIY you could do it and save a lot of money, but it's just too much work for me.
Well good luck, hope this helps