I'm not sure what year your vehicle is, but for a 2003 SE it only lists a half hour of labor to replace the purge canister. The canister itself is around $100.
I can't find a price for just replacing a vacuum line.
If you feel they are charging you too much, call around and get another quote. This should give you an idea if what they're asking is too much.
〉 Answered on Mar 25th, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines