I mean, are you trying to mass produce discs for distribution? If so, I recommend Googling for a duplication service, as it usually saves you time and headache for about the same cost as building or buying your own 7-9-disc duplication setup.

Me and my friend do this dance recital every year, and I forget the name of the place he uses to get the duplications done, but they have speedy turnaround and a box of 100 DVDs usually runs about $125 with the artwork on the discs and in the sleeves.