I just ended up paying out £30 to the post office in the last few weeks. Trying to buy the rest of the BCI Spanish horror titles before they go OOP.
I usually buy R1 discs via
http://www.axelmusic.com/ - since they are based in Denmark, packages they send can avoid customs. The costs are slightly higher than buying direct, but at least you know exactly how much it is going to cost and don't have to lumber down the post office to get your DVDs.