If you are in Karachi then from Plaza you can get new axle outers for both sides in Rs 6500 (Japanese NKN brand).
The axle inners are available at Rs. 12000 for the Pair, Same Japanese brand.
The cost of Chinese outers and inners is approximately Half of the cost of the Japanese ones.
In chinese the quality of a brand called something like "GCK" (the name starts with G but i dont remember the other two alphabets) is considered superior.
Many shops in plaza sell the above. However some one told me that one shop on main road called Al-Hilal is importer of the NKN axle and sells to others as well.