Marriage contract in Muscat

Hi guys, Could you please advise where should I go to draw a marriage contract in Muscat (I want to add conditions that my husband cannot marry anyone else as long as our marraige is valid, and I want to have a right for talaq (divorce with no reason, just like men  can do ) ? And how much does it cost?


Note, I am not asking about marriage certificate, I have it already.

@Allin Theeyes no its not. Its a Forum of expat.com, Where u can ask as expat anything about life in Oman.