I recieved a Fry's credit card in the mail yesterday, so I headed over there this morning to buy a webcam. Since it's going to be outside, I tried to find the cheapest one possible. They had one for $16, and it was pretty small, so I grabbed it along with a 16 foot USB booster extention cable.
I got up to the checkout, and it turns out that camera was on sale for just $8! Woohoo!
I ran the cable out the front window, and adjusted the weather station software.