Hard to say if you dont tell us your acads, research area, paper publication......
Generally, if you are in top 5 college like MIT, Stanford - they somehow always fund their students but medium level, MS funding is very hard.
U of Iowa tries to give most or all of his studdents some kind of assitantship but then U of Iowa is not something extremely great...I am there because two of the professors are doing good research in very specific area of my interest!!!