Cost will be minimal. Time depends from court to Court but should take more than one month. You can always ask a clerk of the FC to follow up on the same and update you when the certified copy is ready.
ok,thanks,is therea way to do it online or personal visit required?
courts are not that much sofisticated to facilitate service of home delivery etc. So your counsel or you has to file CA (application for certified copy) of final decree and order in the family court concerned section. If you can't personally follow up you can find and engage such a person who can get the things in that court.