Car: 92 Camry 4 Cylinder 5 Speed

Ok im driving along in a real stop and go part of town, and when I go to put the clutch in, it vibrates a little, and now it vibrates every time you push it in, but once you push it ALL the way in it stops. I have scheduled a mechanic to check it out, but I would just like to see what you guys would say, here is some awnsers you might want to know.

Makes noise when pressing clutch (while car is on): No
Crunchy or hard to press clutch now: No
Hard to switch gears now: No
Car acts differently: Not that I can tell so far

Again the clutch just shakes or vibrates when pressing it in or out.

I would also like to know a rough estimate on how much it would be to REPLACE my clutch, if possible.

Thanx for the advice.