Unfortunately, not really. but what you could do, if you got a few bucks i would reccomend one of
these Mic Pre's, probally one of the best that you can get for under $100. I know it's an ART, but for the money it sounds good. I got one in my collection, and i like it. And as far as a Mic goes, you could get one of
these Audix OM 2's for Under $100.
Musician's friend isn't the cheapest place to shop, but it's a good starting point for you.
You'll have some decent sounding Vocals for under $200. Trust me, it's worth having a decent Mic Pre plug into the Line in on your soundcard than trying to get a decent PC Mic, I really don't think that they exist. I know Telex has some decent USB Mics, but not for singing.
just my 0000000000002 cents