Cheapest I have seen this boxset in a while - it is the Hammer House of Horror complete boxset, for £17.99 delivered from play.com. Cheapest I can see elsewhere for this at the minute is £30!
Now - play.com state this is temporarily out of stock - but they are really excellent at getting deals back in fast when they write that. I posted a deal before, and the forum members here had already received the deal before the website had been updated to "in stock"!
Details: This British anthology series, produced by England's leading exporters of horror films, told tales of haunted houses, demons, ghosts and other supernatural wonders...
Includes all 13 episodes across 4 discs: The House That Bled To Death, The Silent Scream, The Two Faces of Evil, The Mark of Satan, Witching Time, Visitor From The Grave, Rude Awakening, Charlie Boy, Children of the Full Moon, The Thirteenth Reunion, The Carpathian Eagle, Guardian of the Abyss, Growing Pains.