Just got this Pioneer DVR-108 from newegg.com for $78 shipped. Awesome burner...does dual layer and is super fast. Haven't burned a single coaster with it yet either:
I recommend the NEC 3500 as well. Not the cheapest, but damn sure close to it and probably the best bang for the buck. This drive will be able to anything you will ever need out of a dvd burner at 16x and dual layer.