I have a 1988 YJ. I got a quote of $900.00 for parts and labor ( new pressure plate, clutch disk, slave cylinder, pilot bearing) from one shop. Another shop qouted me a labor only rate of $600.00 if I provided all of the parts.
Preen is a pre-emergent weed prevention product. It prevents weed seeds from germinating instead of killing existing mature weeds. Preen works on a wide variety of annual weeds, but it won't have an effect on perennial weeds because they already have established roots.
Pre-K is specifically to get your child ready for Kindergarten, and is usually either 1 year or one semester before kindergarten. Pre-school is a little earlier, 3-4 years. Often Pre-k is integrated with the preschool programs, they used to be the same thing.