I noticed that this series is now out-of-print. I believe I ended up purchasing every one of the DVD titles, but can anyone explain why so many of the VHS titles weren't released on DVD? It seems likes there are enough films left over for a Creature double feature (Revenge of the Creature/The Creature Walks Among Us) and TWO invisible man double features (Invisble Man Returns/Invisible Woman and Invisble Agent/The Invisible Man's Revenge) as well as a stray Dracula title (House of Dracula). Also, if I'm not mistaken, Universal released only two of the Abbot and Costello monster films. And then there are films like Murders in the Rue Morgue and Island of Lost Souls that may not feature a "classic monster" but are still horror classics. So what happened? Were sales of the double feature titles that bad? Did Universal simply lose interest? Or (as sometimes happens) did the person who oversaw the series leave the company?