The SWV SAMSON double feature is well-nigh impossible to find, since it was cancelled before it got a wide release, as I understand it, just a few screener copies are out there.  I have the SAMSON IN THE WAX MUSEUM and SAMSON VS. THE VAMPIRE WOMEN on the Beverly Wiltshire DVDs available now on Amazon.com.  For some reason the Amazon pages list the manufacturer as "CineVu" but they're the Beverly Wiltshire discs.  They're not going to win any awards, but aside from a brief blivet of video static (once on each disc) I found them perfectly watchable and better quality than the average Alpha disc.   I'm happy enough with these for the price. 

The Lionsgate SAMSON EN EL MUSEO DE CERA, which I also have is definitely better quality than the Beverly Wiltshire disc, but no subs.