New vegan needs advice on which vitamin supplements to take.?

I've been a vegetarian for about 2 years now, and as my new years resolution I'm taking it up a notch by being a vegan. I've lost 15 pounds, i feel morally and physically great! To keep this going though I know without even reading that I need some vitamins to supplement my change in dietary habits. What do you guys recommend? And please include a link to the website of the vitamins if you can. I'm also a college student so lets try to keep it on the affordable side. Thanks guys :)