I got mine from DVD Pacific last December. They're actually cheaper now thanks to the exchange rate. ALthough still around £23 each.
I've been lucky with DVD Pacific and Swedish Post. I've yet to be stung. I took a big risk and ordered the two together to save a few pennies on postage, at about £50, and it got through unbuggered, although that may have more to do with the Christmas rush snowing RM under, rather than any deliberate leniency on their part.
Or you could try Right Stuf, who'll mark down the price on the package if you ask nicely, but you'll still wind up spending so muc more on thing as they are more expensive, that it'll be cheaper to pay Customs.