the expansion tank itself is about 80 bucks.. very easy to swap out yourself...

if you want to replace the rest, here's general prices for the parts (of course you can source for cheaper):

100 - thermostat
140 - waterpump
5 - gaskets and o-rings
80 - expansion tank
30 - hose - expansion tank to upper hose
70 - upper hose
35 - lower hose
XX - other cooling hoses (i think there are 9 altogether but replace as you like)
45 - coolant and distilled water

drive belts if you need it
35 - serpentine belt
20 - ac belt

and if you wanted to do the valley pan gasket since you have it all apart:
80 - valve cover gaskets
150 - valley pan gasket kit


so for 1700 for them to do it, i rather do it myself...