Remember I'm answering your question as stated UNLESS you want to duplicate displays (rarely done.)
There are USB to HDMI adapters which are technically cards.
Is there a way to get more HDMI ports? I wanna have more monitors but i need more ports. So is there a way to get more ports without getting a new graphics card?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic