what would it cost to have the Crank Shaft Position Censor replaced.
on 1998 Subaru Legacy Outback

The check engine light keeps coming on. The EGR was replaced, and now the crank shaft position censor which I got an est. of $275. The car also has a hard time starting....does the clicking before it will turn over. Replaced the battery, but that didn't solve the problem. Got an est. of $295 to repl. Do these estimate seem reasonable ?

The clicking is most likely a wearing starter, if, as you say the battery is still good. As for the crank sensor, I am pretty sure that you have to remove the timing belt, as the sensor is on the front part of the crank shaft.