VAIO adapter not working

Hi frens my adapter is not working ..my model is 19.5 v 3.9A vgp-ac19v33 ..i check the sony site but it is very costly from where can i buy the adaptor..will it not AFFECT IF I USE A non sony adaptor..and how much will be the amount???plz help me urgent guys

and hws the LAPCARE chargers can i use on ma laptop