I had to replace both sets of mine between 3600, and 5900 miles. The rear one went first, and about a thousand miles or so later I had to tear into the front end.
Do this job yourself, and save some severe bucks. It took about 2 hours to do the rear cylinder, and about 1 hour to do the front.
Buy you a friggin' service manual, and handle it yourself.
If you are too much a GEEK to handle this little lesson in mechanics, then you should be drivin' a friggin' Geo.