You can Buy New Rims With exchange for good cost at Khan Tyres Melody market near GPO in Islamabad.
The guy is honest person and informs you about quality of products him self and guides you if you take an advise from him
Sultan Ka Kooh rawalpindi.Enter from murree road on the road which comes after RGH while coming from Islamabad.Carry one straight on the single lane road.Cross Petrol pump.Cross on the way a small concrete bridge(in this region you will see a lot of tyre shops,stop to inquire if you want to),Still drive straight.after 1-1.5 km you will come on your left to a tyre shop by name of DECENT TYRES.this guy has a lot of variety and good reppo but sadly in our country people will decieve you on product quality so be careful