Look under 'More Buying Choices' Used & New.
Following from the earlier threads about the same set at Priceminister which didn't really get going and the DVD set from IWOOT also on Amazon, I found this being sold by Amazon Marketplace Seller 'moviemars-usa'.
Obviously this is still something of a gamble, as the price sounds too good to be true, it may well turn out to be so. It will ship from the US too, so probably a bit of a wait.
However, I've found Amazon very good at ensuring Marketplace sellers play things straight and been able to get my money back dealing directly with Amazon on the very few occasions I've had problems. Therefore I decided it was worth a go.