You should try and find all the same brand of webcams on ebay or something, if they're cheap enough, then customise them all and make your own glaDOS! then sell it for an excessive profit 
i thought bout it but then its finding the right cam and price , then what i'd like to do is add a 2axis motor so it spins around and talk with motion sensor.
DOOOO ITTTT
... DO it.