dude look that shit up man it takes like 1 minute. Assuming this is a non-turbo, with original s4 nonturbo engine-

the pressure plate is $91.36
clutch is $109.74
throw out beaing $33.10
pilot bearing $7.16
pilot seat $2.54

Thats all stock OEM replacement parts, from Mazdatrix. you'll still ahve to ship everything. Clutches 83-92 (225mm non-turbo)

EDIT: don't forget a clutch alignment tool aswell (they're only a few dollars at most)