I'm going to Mexico in a few weeks and I'm looking for a good webcam to use with Skype on my Early 2006 PowerBook. A friend bought me a RocketFish webcam a while ago and it hasn't worked out too well. Most of the time, I get only video or only audio. I rarely get both at the same time. Any recommendations? I've heard that Apple's original iSight is a great piece of hardware, but I haven't been able to find one for less than $100 used. I'm looking to spend less than $50. Thoughts?