Webcams

So I dont feel like writing a REAL entry. But I am thinking about getting a webcam. I was told that I could find a decent one for like 20 dollars. I looked at Staples and they didn't have that many and none were around that price. I think I just want to take stills/pictures and record videos for blogs and other random stuff. And post them online. I don't know anything about webcams, so I was wondering if anyone could advise me. Thanks!