I have some instructional videos I am getting ready to release on DVD and I want to know what is the quickest and most cost effective way to produce these in bulk?

I am open to both customized PC based software/hardware solutions as well as dedicated hardware appliances which perform the same function. All options considered seriously. I don't have a problem building a system for this purpose. If I build something I would prefer it have the ability to make multiple copies at once. I figure I will need to make about 300 copies initially.