The bottom cushion on the driver's seat in my '98 S70 has become worn and unsupportive to the point where it is starting to make my right leg very sore. Is there anything that can be done to rebuild/recondition the seat cushion sort of replacing it (which I'm sure would cost an arm, leg and various other body parts)?

 

I would call junkyards and see that they have in stock, herhaps you can find a good seat there

 

I've been told there are shops that will do that sort of stuff for you. Check into a few reupholstering shops.