'Just Before Dawn' on 88Films DVD is available at
Amazon UK for £5.99
There are a number of copies of 88Films 'Blood Sucking Pharaohs', both DVD and Blu-Ray on
Amazon UK, but they are pretty pricey!
'Blood Harvest', however, is a different matter. As Mr. 42 states, it was pulled from release before it was actually released [although a handful of copies got out] due to some confusion about who actually held the rights to the film.
If you have seen it for £25, I would say 'grab it'!