I think with that kind of budget, you wont find any "good" webcams. Just various shades of horrible.
Just buy whichever looks best and is from a brand you trust. Think maybe the highest resolution you could get in the price bracket is 720p.
Though I'm no expert on webcams, but I was in a similar situation and just bought a cheapo Logitech webcam that I use once in a blue moon. Its fine for that purpose.