indeed it is cheaper in the long run to print / duplicate dvd's your self
I currently do it for mixtapes down here and i invested about 5,000 and got a printer / cd duplicator
http://www.primera.com
i'd do the job for ya but mine is in use right now for about the next month ... booked solid :-/
it is a great side biz to get into
almost 100% hands off and cheap investment