1997 Honda Accord Question: how much to replace my whole right wheel well? ball joints blew out on intersta

you will have to take it to a body shop

IF you can find a shop that will install a used knuckle assembly , then maybe you can expect to spend maybe $400-$600.00 for everything , including alignment. That amount is very subjective to the labor rate in your area and availability of the part. Also IF a shop is willing to do that , they may or may not give any kind of warranty ---get it in writing! Also this is guessing , scince I can't actually see it , so yeah , body shop -or mech. shop ,either one to get a true idea of how much damage there really is and what HAS to be fixed for safety and drivability. the other side should be inspected also , so the same doesn't happen.