Can somebody tell me any way to call pakistan which is cheap enough!?

hi i m in new york and most of my relatives live in pakistan and i m trying to find a way to call them cheaply, mostly they don't have internet so it is not possible to do voice chat, so is there any site through which i can call back pakistan on land line! or can somebody suggest me any calling card which which is cheap one and have good voice quality! Thanks in advance! mostly cards which i use give 34 mins in 5 dollars