BenQ US has this news release today "unveiling" the DW830A. I called BenQ US and they said they should be receiving a shipment of them within a week.
BenQ Unveils Its First Double-Layer DVD Rewritable Drive
New BenQ DW830A Rewritable DVD Drive Features DVD+R 2.4X Double-Layer Recording Speed
City of Industry, CA (May 25, 2004) - BenQ introduced its DVD rewritable drive that supports DVD+R double-layer (DL) recording. The BenQ DW830A features a DVD+R DL 2.4X and DVD+R 8X write speed, as well as DVD+RW 4X rewrite speed in terms of its optical operating performance.