Is the shop ripping me off?

Ths is a follow up on the last post about mitt eclipse '96 clutch

i am new to manual transmission so I forgot to check the brake fluid for the clutch, I couldn't put it in gears and I had to to take it to the shop. They checked and the fluid was empty. After they refilled it, it still didn't work. What is the real problem.
symptoms: I couldn't put it in gears when the engine running. But I can put it in gears when the engine is off. This just happened all of a sudden so I am hoping there is nothing major.

the shop said that: it would cost 350 for labor to take the transmission out to inspect the problems and 200 for hydraulics cylinder or whatever they call it, ( they said there was a minor leak), the clutch parts itself for a stock is gonna be 300. They wouldn't know what would cause the problem unless they take the transmission and take a look. Do they rip me off for the price? I am really concerned about the parts and labor. Plz reply