i've actually found it on a japanese site (
here) for 3800yen (around £17), so that's not too bad at all.
GNBF-7068 Movie / LA SETTIMA DONNA (TERROR / THE LAST HOUSE ON THE BEACH)
DVD 3800yen * 1 Released:2004/12/22
Subtotal : 3800yen
Points Applied: -300yen
Shipping : 500yen
--------------------------------
Total : 4000yen
US$34.56
Ordered :)