Changing Cost of things in game

Simple question - simple answer

Is it possible to change the cost of a unit/building in game for only one player not all?

If so mind pointing out the appropriate action for this.

replace unit with another unit what have different cost but only fro choosen player.

DioD's way might be the only way ;) So you have to make many units of same kind with different cost.

You can do the cost with trigger but then it wont show up right in the tooltip.

thanks for the help but i found another to do the thing i needed. That would of been annoying doing it this way.

-Thanks,Salbrismind

HOW????
Is there a way to change the goldcost of items in-game (all players)??