Well, I did an extensive search on here and probably already know the problem, but want to see if anyone has any insight. Also the clutch is a GT3RS lightweight that has been 100% problem free for many years.

Was driving home from work at normal speeds, went to take my exit, depressed the clutch to downshift and felt a clunk in the pedal. Went to put the car into 2nd gear and it wouldn't go in at all. The pedal was stuck at the floor. I used my foot, and pulled the pedal up and then couldn't press the clutch down at all. I coasted about 500 feet and stopped and turned the car off (hoping it was a fluke).
Well, had the hardest time pressing the clutch to restart the car. The car goes smoothly into gear when its off, but doesn't engage when running. Now I am literally about .1 miles from home and decided to turn the car off, put it into 2nd gear and start it to drive it home, which was successful since I didn't want to leave it on the side of a busy road. So basically the pedal is extremely hard to depress and once I got it started, the pedal was to the floor, but the car did start going even though the clutch pedal was fully depressed.

So, I am guessing from a search the throw-out bearings are toast. Do my symptoms sound like the TO bearings? What cost is associated and how much are throw out bearings? I did find a part # Throw out bearing: 944 116 080 01 and was wondering if I should order anything else. Thanks for any help.